Hi

It is difficult to predict the marks required to get 70 percentile

But when we go through previous year trends then,
In JEE mains 2020 around 40 marks was equivalent to 70 percentile

You can check it by visiting our page the link for the same is provided below

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

But marks required for a particular percentile keeps changing every year  depending upon various factors like  number of students that appeared in the exam, kind of marks obtained by them , toughness level of the examination for different shifts of the exam etc.

So, to be on the safer side try to get at least 50 marks in order to score 70 percentile in your JEE mains 2021 examination.

Now, limited time is left for jee mains 2021 , so to prepare well your jee examination, go through chapters first and your focus should be on grasping concepts , practising questions and then revising them, go through mock test paper sample papers and previous year question papers as it will let you know your preparation level and and weak areas so that you can work on them and perform well in your examination.

Thankyou