This is my POV, I could be wrong.

-Biology is mostly memorising facts / anatomy.

-Add maths / physics / chemistry requires understanding principles, applying it in different scenarios to get answer.

Based on the above 2 things I pointed, out you sure you can be a competent forensic pathologist, which require you to deduce and find out causes of deaths?

Or just a memorise and spit out kind of forensic pathologist?

Just my 2 cents.