Hello

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

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

And, 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

 

Good Luck!