Hello Akshay

Go through the link below and use the college predictor tool to check the NITs and other engineering colleges which you can expect based on your rank-

https://engineering.careers360.com/jee-main-college-predictor

You may calculate your expected rank by this formula-

 

874469 are the number of candidates appeared for the January exam. So rank formula is (100- your total percentile score) * 874469 / 100.
If the number of candidates for April exam increased to 1400000 then your final rank shall be (100- your total percentile score) * 1400000/100

 

It's difficult to tell you the exact qualifying marks for JEE Advanced Eligibility but if you are getting more than 85 percentile score then you have decent chances to qualify for JEE Advanced.

 

Good Luck!

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