JEE

Some general guidelines that can help you get an idea of the score required for getting Computer Science in NITs :
Cutoff Score : The cutoff score for JEE Mains is determined by the Joint Seat Allocation Authority JoSAA which is the authority responsible for conducting the counseling and seat allocation process for JEE Mains qualified candidates. The cutoff score is the minimum score that a candidate must obtain to be eligible for admission to a particular NIT. Factors affecting the Cutoff : The cutoff score for JEE Mains can be affected by various factors such as the number of students appearing for the exam, the difficulty level of the exam, the number of available seats, and the popularity of the course. Average Cutoff Score : In recent years, the average cutoff score for getting Computer Science in NITs has been around the range of 90-110 marks out of a total of 360 marks. However, this score can vary from year to year and also from NIT to NIT. NITs Popularity : The popularity of the NITs also plays a significant role in determining the cutoff score for JEE Mains. For example, NITs located in metro cities like Delhi, Mumbai, Kolkata, etc. , generally have a higher cutoff score as compared to NITs located in smaller cities. To summarize, getting Computer Science in one of the NITs requires a good score in JEE Mains. However, the exact score required can vary from year to year and also depends on various factors such as the difficulty level of the exam, the number of available seats, the popularity of the course, and the popularity of the NIT. "Believe in yourself and all that you are. Know that there is something inside you that is greater than any obstacle. " - Christian D. Larson
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In JEE Main 2023 exam, you need to score at least 125 to 135 marks if you want to get into the 95+ percentile list. Hence, you should target a score of 145 to 155 marks while practising the test series. Clear all your doubts. Consistently practice questions. Whatever your weak link is, whether its speed, accuracy, time management or panic in the exam, improve them now. You need to have good concepts understanding to perform well in Physics and Math. To score 99 percentile in the JEE Mains 2nd attempt, you should target 200+ marks in the exam. Complete all the topics in the JEE Mains syllabus. Give as many tests as you can. Improve your time management skills.

Securing 38-41 marks in JEE Main out of 300 marks is not too difficult. The below are the scoring chapters in JEE Main Physics and Chemistry. Please revised accordingly. Physics
1. Physics and Measurement
2. Work Energy and Power
3. Rotational Motion
4. Kinetic theory of Gases
5. Communication Systems
6. Electromagnetic Induction and Alternating currents
7. Experimental skills
8. Properties of Solids and Liquids
Chemistry:
1. Atomic Structure
2. Chemical Thermodynamics
3. Redox Reaction and Electrochemistry
4. General Principle and process of Isolation of metals
5. S - Block Elements (Alkali and Alkaline Earth Metals)
6. D - and f - BLOCK ELEMENTS
7. Co-ordination Compounds
8. Purification and Characterization of Organic Compounds
9. Some Basic Principles of Organic Chemistry
10. Organic Compounds containing Oxygen
11. Principles Related to Practical Chemistry
12. Chemical Bonding and Molecular Structure
13. Classification of Elements and Periodic table.

Dr. Shakuntala Misra National Rehabilitation University offers B.Tech courses in various disciplines like Computer Science, Electronics, Mechanical, and Civil Engineering. The admission to B.Tech courses at the university is based on the candidate's score in JEE Mains.
As per the information available on the university's website, the minimum qualifying marks required for admission to B.Tech courses at Dr. Shakuntala Misra National Rehabilitation University is 45% marks in JEE Mains. However, the admission to B.Tech courses at the university is highly competitive, and the actual cutoff may vary depending on various factors like the number of applicants, the number of seats available, and the difficulty level of the exam.
Based on your JEE Mains score of 64%, you may be eligible for admission to B.Tech courses at Dr. Shakuntala Misra National Rehabilitation University, provided that you meet other eligibility criteria like age limit, academic qualifications, and document verification.
I would suggest you to visit the official website of the university or contact their admission office directly for further information on the admission process, eligibility criteria, and cutoff for B.Tech courses at Dr. Shakuntala Misra National Rehabilitation University.