Get the Arihant Bitsat Book, preferably 2015 edition from any seniors or old book store. ( As the new edition doesn’t contain any previous year papers)
Now follow this:
Mock test – Analyse – Improvise – Repeat.
Do one paper in the morning then analyse and improvise till afternoon.
Do second paper by the evening and anaylise and improvise till night.
Stop quora, Facebook and WhatsApp. And just study hard.
Give your best and be happy no matter cause you gave your best!
All the best, may the luck be with you!