BITS Pilani - Birla Institute of Technology and Science Answered Questions

BITS has provision for direct entry for toppers of different board of examination 10+2. Eligibility criteria is as follows:
"To be eligible for admission under the 'Direct admission to Board toppers' scheme, the candidate should be the topper from the science stream having taken physics, chemistry, mathematics subjects in 12th. To identify the topper, the following criteria is adopted.
The topper is the student who fulfills the following criteria:
a) has taken physics, chemistry, and mathematics subjects in 12th class examination and
b) has obtained the highest aggregate percentage of marks in 12th class among all the students who have taken physics, chemistry, and mathematics subjects in 2016 from the board. For the purpose of calculating, the aggregate percentage, the aggregate marks should include the marks of physics, chemistry, and mathematics subjects in addition to other subjects which are required to pass the 12th class examination from the board under consideration. Further, the physics, chemistry, mathematics subject marks should be included in the aggregate, irrespective of whether the physics, chemistry, and mathematics subjects are identified as main/ optional/ elective in his mark sheet(s)".

Yes, you can. But the procedure is pretty cumbersome. First of all, the only genuine reason is entertained (like clashing with another exam).You'll have to send in your reason to change the date, along with necessary documents via post (the exact procedure must be given somewhere on bitsadmission.com, if not contact BITS people).
Also, you don't get to choose your new slot, they'll give you the slot near the end dates of exam and add to that, you have to come all the way to the location to take the exam, you don't get the centre of your choice as well.