SAT Biology E or M

SAT Biology E or M? I don’t really prefer one over the other. Any tips please?

It depends which you are generally better at. In a personal point of view I didn’t do a bio subject test for my SAT 2’s just because many people recommended that the best combination was maths, physics and chem. E is more memorisation and M is more understanding of the actual content, so depends on your own study strategies. But like I said it comes down to personal preference and which subject test will help your desired degree.