Hello Ananya,
As you have got a good rank enough to get admission in a good college for pursuing the B. Arch degree.
With this you can apply for the many colleges to get admission. As your 12th percentage are also fulfilling the required criteria of 75%.You should definitely apply for many colleges to continue your study.
You can go through the following link for more details about some colleges from where you can get admission-
https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

Dear as your rank you can apply for your regional or straight colleges because as per your rank it's very difficult to get NITs or other good govt colleges. You can explore other option too there are a lot of private colleges or university which offer admission and provide scholarship as per your jee marks or entrance exam. Explore these universities like LPU, CU, AMITY, SHARADA etc 

Best wishes for your future

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