I got 43 percentile in jee mains paper 2 is it a good percentile

Hello,

40 percentile in JEE Mains means rank approximately around 5,30,000 which is not a good rank to get admission in any good college or university.
You'll only be eligible for admissions in private universities/colleges.
To know more about your chances of admission in different colleges try the JEE Main college predictor.

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

Although I'll suggest you to take a year drop and work harder for JEE mains 2021 examinations and score good marks to secure a nice rank so that you can get easy admission in top colleges and universities.