The exam pattern for BITSAT 2019 is:

Part 1(Physics)-40 questions

Part 2(Chemistry)-40 questions

Part 3[i](English Proficiency)-15 questions

[ii](Logical Reasoning)-10 questions

Part4(Mathematics/Biology for B.Pharma)-45 questions

So, if you want to apply for B.Pharma courses in any of the BITS, only then you will have to appear for the Biology exam instead of Mathematics. The exam pattern remains the same with a 3 hour long MCQ type exam rewarding 3 marks for each correct answer and deducting 1 mark for each negative answer.