Maharaja Agrasen Institute of Technology

Your strategy totally depends upon your goal, and upon your situations. Speaking about a general, non-ews student, you need a percentile greater than 92, for which you'll only get a seat in the spot round, for biotech or mpae at NSUT/NSIT. Marks anywhere around 110 to 120 could be enough, considering the exam is now of 300 marks. Strategies that could work would be -
Download subjectwise JEE Mains archive for previous years. Revise the notes/formulas/questions practiced of a particular chapter of your choice each day and then attempt just the JEE Main part of archive only (leave out the JEE advance questions), and complete 1 to 2 chapter (for Physics and Maths or upto 3 to 4 (for Chemistry each day. Try to analyse what mistakes you made and how would you correct them, the very same day. Just simply watching the solution on YouTube or on Google will be enough. After a month, you would have covered most of the syllabus considering you do as said sincerely. Now download all the 16 question papers of JEE Main 2019 and the 8 question papers of JAN, 2020. Attempt 2 complete tests each day and don't forget to learn from your mistakes. Before starting your tests each day, just revise formulas or notes for any 5 chapters of your choice. And next 5 the following day and then similarly the next. By doing this you'll not forget formulas and also learn how to attempt the exam simultaneously. Leave everything on the day before your actual exam and just relax and have faith in your hardwork. I used this strategy myself last year and was able to get a 96+ percentile. All the best!