hello aspirant......

yes it is possible to prepare jee mains in short period by following the above instructions

first make a plan so that you can get little bit analysis on the subject you are having and prepare timetable basing on the easier the topic you feel give less time and harder the topic you feel give or spend more time on that topic by managing your time

try to solve mock tests and also try to solve minimum 150-200 mcqs daily

i hope this information is helpful

all the best.

1. Don't panic. Keep telling yourself that panic won't help and try to keep yourself as calm as possible.

2. STOP studying new chapters completely. It will NOT help at this moment. Revise the basic concepts and formulas, especially for the areas that are your strongest (yes strongest, not weakest). Make sure you get everything right in these.

3. Try some practice tests. A lot of them are available online with solutions. You could try the previous year Question papers or other sample papers at this time. The purpose is to put yourself through the 3 hour exam routine (preferably from 9:30 to 12:30) multiple times so that you feel comfortable on the day of the exam. (This routine is very important and neglected a lot.) Practice at least  3-5 (it would be ideal though if you get 6-8) tests before exam.

you can prepare for jee main quicly by either joining a crash course near by you which offer simple tricks to solve the questions easily with practice or you can go through books id you dont want to waste time in coaching.
JEE Mains in 40 days - Physics , chmeistry , mathematics by arihant. is the best book to prepare in short for jee mains. it carries the main topics and helps you tonlearn quickly with clear concepts. and also this book is cost effective and not much expensive and is easily available onlin as well as at any book store. All the Best !!