respected sir, can we repeat bit sat entrance test in 2017 only if we are not satisfied with our score?

If you want to repeat BITSAT come and give your exam next year

No you cannot...
Only one chance is given to any student whether he/she is satisfied or not

Dear vaishali you cannot,even if its an entrance test or any other exam its frequency for any particular student in a year is one.BITSAT has a schedule for its examination between which they select places where on that very particular day exam will be conducted and same goes with the other days too(BITSAT This year from 16-30 may).So if you are sure you will not clear the examination this year then better leave it and if you want to apply for it again then you will have to wait for next year.

You can give BITSAT exam once in a year only so if you are not satisfied with the score then you can only apply for next year. Kindly tell how much you are expecting if you are done with the exam?