Hello Shrishti,

If you have filled for both the exam as they provide an option their for both exam with a discount price.. but it isn't  compulsory to attempt both and It will not affect your first paper if you left the second one. Both the papers are different & don't have any link between them. Paper 1 is for b.tech whereas the other paper is for b.arch entrance. So don't worry & focus on your favourite one.

Thank you.

Hope it helps.