Hiiiii

Ofcourse Its possible if you give all your efforts. All you need is the dedication and honesty towards your work and study.
First things first for the next 4 months in your hand try to cover all the important topics. Do not waste time unnecessarily studying anything and everything coming your way
Try to clear all your concepts and have a clear vision about any topic you have covered.
Don’t stress out, just keep up the good work with all your dedication and desire to get through it.
Firstly make a schedule of your daily routine and fix 8-10 hours of study with maximum possible efficiency.
Sleep efficiently and wakeup early and revise all the your topics covered yesterday, its one of the best practices to do.
Smart study is something which you need to practice at this point of time.
There’s no need of studying continuously, divide your day in slots of 3-3 hours  with breaks in-between. So that both your body and mind remains relaxed and ofcourse efficient.
Practice Practice and Practice!!!
Note down all the formulas and important concepts so that they become handy for revision.
Don’t let your doubts pile up. Talk to your teachers they will be more than happy to help always and of course internet is always there. You can also post your questions on careers360 so that we can help you.
Always revise in your mind before sleeping as it would help you in remembring things more efficiently.
And also,
Take online mock tests.
Improve your calculation speed.
Try to solve sample papers and previous year papers regularly and time all your papers so as to analyse your speed and result.
Focus on tricks to solve your questions rather than wasting time on lengthy calculations.
Create exam hall like situation when you are solving your papers and remove all the disturbance. Keep a water bottle with you so that you are not getting disturbed.
Don’t get demotivated if your score is less in earlier attempts as it would automatically gain a pace with time.
Also I won’t advice you for late night studies, Sleep Early so as to keep your mind active and fresh.
And the most important advice don’t let anyone or anything break your flow, forget all the occasions for these 4 months.

And Always remember hard and continuous work done with dedication never fails.

ALL THE BEST.

Competition is tough nowadays. Especially for JEE Mains. Still it is not impossible to crack JEE Mains on the basis of self study. The only thing will be if you join coaching you will be able to clear your doubts on the other hand if you self study you have to clear your doubts on your own. Still if a person is determined anything can be achieved.

Time needed to spend on self study :-

Remember one thing that you do each subject that is Physics Mathematics and Chemistry everyday. Give equal importance to each and every subject. If you find some chapters in a subject difficult then give it a little more time. Before sleeping revise everything you learnt that particular day that will make your concepts even more stronger and you would remember it for long. Don't forget that health is important too. So take proper sleep and study everyday every subject.

Study as many hours as possible in a day but don't exhaust yourself too much that you cannot study other day .

If you still have any queries feel free to ask in the comment section down below.

You can crack the exam if it is planned & followed properly. I would suggest you to go through well with NCERT books and  Here are some preparation tips you can follow:

Make your time schedule: Make your study time schedule as your convenience & devide the time subject wise & topic wise

Make your Basic Concepts Strong: While it is essential to study the topics mentioned in the official syllabus, it is also advised to study the basic concepts well first. By knowing the basic concepts of the units involved in the examination, you will be able to understand each topics well and in depth. This will result in a greater understanding of the topics and will make it simpler for you to study complicated concepts present in the syllabus.

Improve your Weak Points: Stressed over some topics or formulas which you just cannot seem to understand? Give more time and focus on these topics to improve it. Keep small notes and constantly revise those concepts which has been hard to understand. By constantly studying the topics you find difficult.

Write Notes and Prepare Flash Cards: Like discussed in the previous strategy, keeping notes greatly helps during the preparation process. Notes written in small diaries are highly accessible and you will be able to study from them anywhere anytime. By writing down those complicated theories and formula and revising them, you will be able to remember and understand them more efficiently. Similarly, create flash cards to help you with quick studies and revision.

Attempt Mock Test and Solve Sample Papers: Mock tests will give you an almost real experience of how the examination will be. By solving mock tests, you will be able to work on time management while at the same time understanding the question paper pattern.

Revision: While studying it is important to revise those topics which has already been studied. It is advised that each day, a certain amount of time should be divided for revision purposes. Revision is very important as the syllabus is quite vast and all topics have similar importance level which has to be remembered and known by you.

You can refer the below given link for the time table of JEE Preparation.

https://engineering.careers360.com/articles/time-table-for-jee-main-2019-preparation

Good Luck!