The easiest way to score above 200 in JEE Main is to score more than 95+ in Chemistry. It is the easiest section and involves less calculation. For, preparation go through the NCERT books thoroughly. Go through the previous years' question papers as well, the mark distribution almost remains the same.
Mathematics is scoring too but it takes longer to finish the section. For mathematics, practice as much as you can. Solve coaching materials, Arihant book series, NCERT, and previous year’s questions.
The physics section is often unpredictable. You can follow NCERT, HC Verma to prepare for Physics.
If you prepare well, Mathematics and Physics section should fetch you more than 110+ marks put together. This is the easiest way to score above 200 in JEE Main.
As the syllabus for preparing for JEE Main is vast, you have to work smarter to cover most of the syllabus in a short period of time.
Lastly, try to stay healthy, maintain a proper diet and get good sleep. You need to maintain your physical and mental strength to crack the exam properly.