Introduction
In our last lesson, we navigated the essential first step of the All India Quota (AIQ) counseling: online registration and fee payment. By completing that process, your sister's candidacy is officially active in the Medical Counselling Committee (MCC) system. Now, we move to the heart of the counseling process, where your strategic input directly determines the outcome.
Today's lesson explains the rules for Choice Filling and Choice Locking within the MCC portal. This is the phase where you translate your sister's aspirations and your research into a concrete, prioritized list of medical colleges. From your perspective as a developer, you can think of this as defining the payload for a critical API call. The choice_list is an ordered array of college codes, and the allotment algorithm is the server-side function that processes this array sequentially. The order is not just a preference; it is the fundamental logic the system will follow. Mastering the rules of creating and finalizing this list is paramount to maximizing your sister's chances of securing the best possible seat.
The Core of Counseling: Choice Filling
Once the registration period ends, the MCC opens the portal for "Choice Filling." This is a dedicated window of time, usually a few days, for candidates to create and submit their list of preferred colleges and courses (MBBS in this case). The allotment software is methodical and impartial:
- It considers the candidate with All India Rank 1 and checks their first choice. It allots that seat.
- It moves to Rank 2, checks their first choice. If available, it's allotted. If not (because Rank 1 took it), it checks their second choice, and so on.
- The system repeats this process for every candidate, moving down the rank list. When it gets to your sister's rank, it will start from her choice #1 and go down the list until it finds the first available seat.
This means two things are critically important:
- The system will never allot a college that is not on the candidate's list.
- The system will never allot a lower-preference college if a higher-preference one is available for that rank.
The official MCC portal is where all this action happens. The screenshot below shows an example of the MCC website where announcements related to choice filling are posted.

The Official Rules of Choice Filling and Locking
To understand the precise mechanics, we'll consult the official MCC Information Bulletin, which is the ultimate source of truth for all rules.
[PDF] NEET-UG (MBBS/BDS/B.Sc. Nursing) COUNSELLINGM CC - S3waas
This document contains the definitive rules. We will focus on the chapter on the counseling process and the FAQs that directly address choice filling and locking.
First, get a high-level view by looking at the flowchart on page 8 under the heading "Flow Chart for Process of Counseling". Note the box that says Submission of choices, which comes right after registration. Next, navigate to the "Frequently Asked Questions" section, starting around page 38. Pay close attention to the answers for the following questions, as they form the basis of the rules: Q. No. 5: This clarifies the most common query: Is there a limit on the number of choices you can fill? The answer is a definitive no. Q. No. 7: This is a crucial one. It explains the importance of filling choices and what happens if you forget to lock them. Q. No. 18: Read this to understand the flexibility you have. It answers whether you can modify your choices before locking. Q. No. 19: This explains how to get a record of your finalized choices after locking.
Let's consolidate these rules into a clear summary:
- Unlimited Choices: You can and should add as many desirable colleges to the list as possible. There is no penalty for a long list.
- Modify Anytime (Before Locking): You can add, delete, and re-order your choices any number of times during the choice-filling window, as long as you haven't locked them.
- Locking is Final: Once you "lock" your choices, you are committing them for that round. They cannot be changed or edited by you or even by the MCC. Think of this as
git commit --no-amend. - Automatic Locking: If you forget to lock your choices before the deadline, the system has a fail-safe. It will automatically lock the last saved version of your list. While this is helpful, it's best practice to consciously review and lock the list yourself.
- Keep a Record: After locking, always download and print the list of locked choices. This is your official proof of submission.
From Rules to Strategy: Best Practices
Understanding the rules is only half the battle. The other half is applying them strategically. While we will build a detailed choice-filling strategy in a later module, let's touch upon some foundational principles.
A great resource for this is the article "NEET UG Counselling 2025 | Choice Filling Tips," which offers practical advice.
NEET UG Counselling 2025 | Choice Filling Tips to Secure Your ...
This article provides excellent, actionable tips on how to approach choice filling and avoid common errors.
Read the section "How to Construct Your Preference List for Medical Colleges?". Focus on the advice to be liberal with choices and to mix college types according to true preference, not just perceived college tiers. Next, review "7. Final Review and Locking". This reinforces the importance of a final check and the consequence that a list cannot be edited after locking. Finally, scan the table under "What are the Common Mistakes to Avoid During Choice-Filling?". Pay particular attention to the mistakes of locking too few choices and the danger of forgetting to lock. Also, note the FAQ No. 10, which clearly explains the difference between choice filling and choice locking.
The key strategic takeaway is this: Your preference list must be in your true order of desire, from your absolute dream college at #1 to your most acceptable backup option at the end. Do not try to "game" the system by putting a "more likely" college ahead of a "dream" college. If your rank is good enough for the dream college, the system will give it to you. If you place the "more likely" college first, the system will allot it and never even check your dream college.
Conclusion
In this lesson, we have demystified the process of Choice Filling and Choice Locking in the MCC portal. You now understand that this is not just a simple form submission but a highly structured process governed by firm rules, where the candidate's input—the ordered list of choices—is the single most important determinant of the outcome.
Here are your key takeaways:
- Choice Filling is the process of creating a prioritized list of desired colleges. The order is absolute.
- Unlimited choices are allowed, and it is strategic to list all colleges your sister would be willing to attend.
- Choice Locking is the final, irreversible step of submitting the list for a specific counseling round.
- If you forget to lock, the system automatically locks the last saved list at the deadline, providing a crucial safety net.
- The strategy is simple yet vital: list colleges in the true order of preference, from top choice to the last acceptable option.
Now that we have defined the input for the allotment algorithm, our next lesson will explore the output. We will examine the rules for AIQ Round 1, including the seat allotment process, what to do when a seat is allotted, and the important concept of a "Free Exit".