Dear Aspirant,

With 42 marks its not quite possible to get 98 percentile in JEE Mains.Nearly 125-130 + marks are required to achieve 98 percentile .

Check this : https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

For jee mains :

See you need to find out your weakness and strengths , find out what went wrong. Try to focus on main topics which can fetch you more marks

Check these :

https://engineering.careers360.com/articles/jee-main-important-topics-books

https://engineering.careers360.com/articles/most-important-chapters-of-jee-main

https://engineering.careers360.com/articles/most-easy-and-scoring-chapters-for-jee-main

https://engineering.careers360.com/articles/important-topics-for-jee-main-and-advanced

TIPS FOR JEE MAINS :

https://engineering.careers360.com/articles/how-prepare-for-jee-main

Improve your weak subjects. Do as many mock tests as you can .

Check out mock tests by careers360:

https://engineering.careers360.com/articles/jee-main-mock-test

FOR JEE ADVANCED :

See there is no percentile system in JEE Advanced , pattern of question paper changes every year. Find out more about JEE Advanced here :

https://engineering.careers360.com/exams/jee-advanced

TIPS FOR JEE ADVANCED : https://engineering.careers360.com/articles/jee-advanced-2021

TIPS BY TOPPERS:

https://engineering.careers360.com/articles/jee-main-preparation-tips-toppers