Hello,
For scoring well in the exam by focusing on a smaller portion of the syllabus, you should concentrate on the chapters that usually have high weightage and are conceptually manageable. In Physics, topics like mechanics, waves, thermodynamics, and electricity often help in securing good marks. In Chemistry, focus on physical chemistry basics, organic chemistry fundamentals, and important inorganic chapters. In Maths, concentrate on algebra, coordinate geometry, and basic calculus concepts. Studying these key areas with proper practice can help you score well even if you cover only a part of the full syllabus.
Hope this helps you.

Hello there!

Being prepared for high scoring chapters is very necessary specially when it comes to JEE mains, it enhances your chances to score more.

Here is the link attached from the official website of Careers360 which will provide you with the list of important and high scoring chapters for Jee mains examination:

https://engineering.careers360.com/download/ebooks/jee-main-highest-scoring-chapters-and-topics

thank you!