How to get a 90 in Biology

Hi I really want to get at least a 90 final average in Biology but I’m really struggling with a hard teacher. How can I get a 90?

1st quarter: 87
2nd quarter: 78
3rd quarter: 85

I still have one quarter to go and the regents exam counts as a fifth quarter.

You would have get a 100 in the 4th quarter and 100 on the exam