If you are getting 200+ in mock tests then you can score 250+ in real BITSAT exam because mock tests are bit difficult than actual paper of BITSAT. But it doesn't make very big difference in your performance on that day. BITSAT is all about speed and accuracy. Try to done ENGLISH section correctly because it matters a lot in rank . Otherwise BITSAT paper is very easy but number of questions and time limit makes it difficult .

• As BITSTAT is speed and accuracy based exam
• You should not leave any topic and prepare each and every topic
• You should practice daily each paper and work on your weaknesses.
• You can also refer apps Available on play store which will give a good idea of exam pattern.
• Attempt all the previous years papers you can get more ideas about how much you can score.
• Do practice by solving online as you have to solve on computer during your real test.
• You can practice online ,there are many papers available which you can practice.
• Knowledge matters in BITSAT more you put efforts while soving questions as time limit is very less.
• By following ARIHANT guide you can get good knowledge about the exam pattern.