Yes, you can. Just keep your head and stop doubting yourself. Oh, and stop putting stupid questions like these on quora and everywhere. Mains and BITSAT are quite different when it comes to format. Study, give a few mock tests to get used to the format, and just generally stay focused. You still have a few days, enough to make a difference between you, and the people who will give up/stop working hard after mains.
So yeah, I’d advice you to use this time to create the difference. Good luck.