Well, attempt the easy subject first. Whichever is easy according to you, for maximum aspirants it is the biology section. Go for it first. Try to solve 90 questions in 35 to to 40 minutes max to max.
Then you can go for chem. As it is tricky and fully ncert based. Doesn’t take much time. I think phy should be attempted at last with a peace of mind as you’ve completed the other two sections. Concepts should have a strong grip.