Hey, for taking admission into BITS Pilani you have to give their entrance exam known as BITSAT.

BITS Pilani will conduct BITSAT 2020 exam in online mode for admissions in UG and integrated first year programmes - B.E., B.Pharm., and M.Sc at different BITS campuses. The entrance exam will be of three hours duration, comprising of 150 multiple choice questions divided into four parts. Each question will four answer options, out of which candidates will have to choose one correct answer.

You can check full details from the given link -

https://www.careers360.com/exams/bitsat