200 + score in JEE paper 2 means how.much percentile marks it could be

Hello!

Percentile also depends on the performance of other aspirants who appeared for the exam along with you. That makes it harder to determine until results come out. Instead, determining your rank in accordance to your score could help you to know which colleges might accept your application on the basis of the last year's opening and closing rankings.

Here's the Careers360 JEE Main Paper 2 Rank Predictor: https://engineering.careers360.com/jee-main-architecture-rank-predictor

And here's the rank list for opening and closing ranks on basis of JEE Main Paper 2 for the previous years:

https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

All the best!