Hello!
Its difficult to predict actual rank or JEE advanced qualify marks. you may calculate your expected rank by this formula

100 - your total percentile score is the percentage  of people ahead of you. 869010 are the number of candidates appeared for Jan exam. So rank formula is (100 - your total score) X 869010 /100. If the number of candidates for April exam increased to 1200000 then your final rank shall be (100 - your total score) X 1200000/100.
Now according to me your rank at this percentile will be around 3700-4000 after April mains. If your home state is Tamil nadu then you stand a good chance to get CSE in NIT Trichy else it is difficult as the cutoff for NIT Trichy CSE  for other state general category student is around 1300-1500.
However you may be able to get CSE in MNNIT, ALLAHABAD Or NIT, Rourkela which are also good NITs.
Hope this helps.
Thanks and regards
Ayush

You haven't mentioned whether you belong to Home State or Other State Category. This is important because the cut offs are different for Home State and Other State Category Students. Meanwhile, in 2019, the cut offs for CSE for NIT Trichy have been as follows:

General Category for CSE

Male Home State: 5325

Male Other State: 1373

Female Home State: 4075

Female Other State: 2371

Having said that, your rank can be predicted by using the formula, (100-your total percentile)*869010/100. In your case, your approximate rank would be 2867. Let's say the number of candidates for April exam increased to 12,00,000 then your final rank shall be (100 - your total score) X 12,00,000/100. Now cut offs change every year depending on various factors.

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