sir, I am getting 180+ in mock test and targetting march as my main attempt. so can you guide me how to score b/w 200-250 for cse in above colleges

I am targetting iit but I want either electrical or cse in iit which is possible only when I get triple digits rank in jee advanced. So first I am trying to secure cse in this colleges which are considered to be good wrt iit's.

gr8gamers2 Look securing 180/300, will surely get you past the
99.0-99.3 percentile Barrier, as per my prediction.
Second JEE Main Session onwards, you may try to capitalise in your weak areas and make sure you solve atleast one or two Mock Test/Test Series Paper every week, followed by Proper Analysis.
After First JEE Main, If Possible take Allen Leader Online Test series, and trust me it will be beneficial. You may even use Resonance Rank Booster for JEE Main and Advanced and Target Solving the Complete Series before JEE Advanced, you effectively have a good 6 months for the 6 Books ( 2 Each for PCM Mains&Adv). Also you may Take Disha Target JEE Advanced Book. It has some very good Mock Test Papers besides having detailed solutions of JEE Advanced Previous Years Papers of Last 15-16 Years (Much Better than Arihant).

gr8gamers2 And secondly just focus on the Exams and securing the required or target score, dont think much about the Institute. You surely will get somewhere, following this optimistic approach.

Abhishek Roy Thank you sir for your advice. I will be working hard for getting into my dream college.