LeetCode Study Plans (Technical Interview Prep)
LeetCode study plans organize coding practice around common data structures and algorithms. Choose a plan that fits your timeline, build a steady weekly routine, and review mistakes instead of chasing a problem count. To check readiness, solve unfamiliar problems under time limits, explain your reasoning, and test your code before applying that practice in mock interviews.
A study plan can make interview prep feel less like a wall of unrelated questions. The useful progress is not a rising total of solved problems; it is being able to recognize a pattern, choose an approach, explain why it works, and adapt when a question changes.
I recommend treating LeetCode as a practice tool, not a course credential or a hiring test. The plan gives you structure. Your own review, timed practice, and communication work turn that structure into preparation.
LeetCode as non-credential interview preparation
LeetCode study plans are collections of coding problems grouped to guide practice. They can help you build data-structures-and-algorithms skills for internship, new-graduate, or experienced software engineering interviews. They are not accredited academic programs, college courses, or standardized credentials, and finishing one does not prove that you meet a particular employer’s bar.
LeetCode’s named plans include LeetCode 75, a 75-problem set, and Top Interview 150, a 150-problem set. These are practice sets, not hiring standards. Employers set their own interview formats and expectations, which can also include system design, project discussion, or behavioral questions.
Choose a plan based on time and current skill, not on the assumption that more problems always mean better preparation. The useful question is whether you can solve unfamiliar questions and explain your decisions.
Choose a plan that fits your starting point
A study plan is a sequence of practice, not a fixed promise about how quickly you will become interview-ready. Your available hours, coding experience, target roles, and gaps all affect the pace. Use the timelines below as planning ranges, then adjust them after a short diagnostic.
| Option | Suggested preparation window | A practical fit |
|---|---|---|
| LeetCode 75 | 8–12 weeks | You have limited prep time or want a focused review |
| Top Interview 150 | 12–20 weeks | You have more time to build breadth and revisit topics |
These ranges are starting points, not official LeetCode deadlines or guarantees. If you have less experience with coding interviews, plan extra time for foundations and review. If you already solve these problems regularly, you may move faster, but still test yourself on unseen questions.
Curriculum and requirements: study plans, prerequisites, and readiness benchmarks
A useful curriculum moves from core tools to mixed practice. Before starting, be able to write code in one interview language and use arrays and strings, hash maps, stacks and queues, recursion, sorting, and basic complexity analysis. You do not need to know every pattern in advance, but you should be able to read and run code in your chosen language.
Big O is a way to describe how an algorithm’s time or memory use grows as the input gets larger. For example, when discussing a solution, explain its time and space complexity in clear terms rather than naming a formula without context.
Diagnose gaps before you schedule the work
Start with several mixed-difficulty problems without hints. Choose questions from more than one topic, and give yourself a reasonable attempt before looking at an answer. The point is not to score yourself against other candidates. It is to find the parts of the process that need work.
For each attempt, record whether you could:
- Identify a possible pattern without being told the topic
- Explain the approach before coding
- Write working code in your chosen language
- State time and space complexity
- Test edge cases, such as empty input or repeated values
If you struggle with syntax, review your language basics before adding more problems. If you can code but cannot explain your approach, practice speaking through the reasoning. If one topic repeatedly slows you down, schedule targeted review rather than restarting the whole plan.
Use a readiness test, not a completion count
For each topic, try representative unseen problems under a 30–45-minute time limit. A useful attempt includes a clear approach, working code, an explanation of complexity, and checks for edge cases without hints. One success is not proof that you have mastered a topic; look for consistent performance across different problem statements.
When you miss a problem, label the reason. Common categories include not seeing the pattern, choosing an unsuitable data structure, making a coding error, missing a boundary case, or running out of time. That record tells you what to practice next.
Academic success: practice systems, feedback, and mock interviews
Consistent practice works best when each session has a purpose. Solve a problem, review what happened, then return to missed questions later without reading the solution first. This helps distinguish real understanding from recognition of a familiar answer. Keep a short log of patterns, errors, and edge cases you missed.
A simple review entry might read: “Used a hash map to track seen values; forgot duplicate input; revisit in three days.” Keep it brief enough that you will actually use it. The goal is to make repeat mistakes visible, not create a second full-time job.
A weekly routine you can sustain
Set a weekly schedule around the time you can protect. The example below assumes about six hours per week; it is a planning model, not a required pace. If you have fewer hours, keep the same mix and extend the calendar rather than skipping review.
| Session | Time | Focus |
|---|---|---|
| Topic practice, twice weekly | 60 minutes each | Learn or reinforce a pattern; attempt problems before viewing hints |
| Review, once weekly | 60 minutes | Re-solve missed problems from memory and update your error log |
| Timed mixed practice | 90 minutes | Try unfamiliar problems without topic labels |
| Mock interview and review | 90 minutes | Explain your approach aloud, code, test, and reflect |
In a mock interview, practice the full exchange: clarify the prompt, describe a plan, code, test, and discuss complexity. If you get stuck, say what you have considered and what you would check next. Clear communication does not replace a correct solution, but it lets an interviewer follow your reasoning.
Use solutions as feedback, not as a shortcut
When you cannot solve a problem, make a serious attempt before viewing hints or a solution. Then close the explanation and rebuild the approach from memory. Later, try the problem again or solve a different question that uses the same idea.
Memorizing code can create a false sense of readiness. A small change in a constraint may require a different approach. To check transfer, explain why the method works, name a case where it could fail, and compare it with at least one alternative when relevant.
Illustrative practice cases: turn the plan into a routine
These cases are examples of how different learners might use a study plan; they are not measured outcomes or claims about real candidates. The purpose is to show how a schedule can change with a person’s starting point, time, and needs while keeping the same readiness checks.
Case 1: A student with a short runway. A student has about ten weeks before internship interviews and already writes code in one language. They choose LeetCode 75, set aside several sessions each week, and use an early diagnostic to spot weak areas. In the final weeks, they add mixed timed practice and mock interviews rather than trying to rush through every remaining question.
Case 2: A working professional with more time. A professional has several months and can study a few hours each week. They use Top Interview 150 as a longer practice sequence, track recurring errors, and review earlier topics as they go. If work limits a week’s study time, they extend the plan instead of treating a missed session as a reason to abandon it.
Case 3: A learner who knows the answers but struggles under pressure. This learner recognizes familiar problems but often needs hints on new ones. They pause new problem volume, re-solve missed questions from memory, then add timed problems with different wording. Their check is whether they can explain and adapt the method, not whether they recall a previous solution.
The shared lesson is to adjust the schedule around the gap you found. A plan is useful when it changes what you do next.
Career pathways and employment outcomes: apply the skills
LeetCode practice can support preparation for technical interviews, but it is only one part of a job search. A completed plan is not a formal credential and does not guarantee an interview, offer, or employer recognition. Avoid listing plan completion as a certification. Instead, describe relevant programming skills and projects accurately, and prepare to show what you can build and explain.
Match your preparation to the roles you are pursuing. Read job descriptions and interview guidance where available, then note whether the process emphasizes coding, practical software work, system design, or other skills. Continue to build projects and practice explaining your contributions, since coding exercises do not show every part of your engineering ability.
After an interview, write down the kinds of questions you faced and where you struggled. Use that feedback to choose the next practice topic. If you pass the coding portion but struggle to discuss projects, shift some preparation time toward project and behavioral answers. The best plan is responsive to evidence.
Frequently asked questions
These answers address common questions about choosing, pacing, and evaluating coding practice. Use them as general guidance, not fixed hiring rules. Your available time, prior experience, target role, and employer’s interview process can change the right approach.
How long does it take to complete LeetCode 75?
A reasonable planning range is 8–12 weeks. Your pace depends on prior experience and weekly study time; the range is not an official deadline.
How long does Top Interview 150 take?
Plan for about 12–20 weeks as a starting range. Extend that window if you need more time for review or are new to interview-style problems.
Should I choose LeetCode 75 or Top Interview 150?
Choose LeetCode 75 for a more focused set or a shorter preparation window. Choose Top Interview 150 if you have more time to practice and review a broader set. Neither plan guarantees readiness.
What should I know before starting?
Be able to code in one interview language and use arrays, strings, hash maps, stacks, queues, recursion, sorting, and basic complexity analysis. Review any gaps before increasing problem volume.
How many problems should I solve each day?
There is no universal daily target. Set a weekly schedule you can sustain and include time to review mistakes, re-solve problems, and practice explaining solutions.
When should I look at a solution?
Try the problem first and note where you get stuck. Then study the explanation, close it, and rebuild the solution from memory. Revisit it later without hints.
How do I know if I am ready for interviews?
For each topic, solve representative unseen problems in 30–45 minutes, explain your approach and complexity, and test edge cases without hints. Also practice communicating in mock interviews.
Does finishing a LeetCode plan count as a certification?
No. Plan completion does not provide college credit, accreditation, or a standardized proficiency score. Employers set their own interview criteria.
Can LeetCode practice guarantee a job offer?
No. It can help you practice coding problems, but hiring depends on each employer’s process and other parts of your background and interview performance.
(This article was written by one of our staff writers, James Holloway. Visit our Meet the Team page.)
