Tips on How to Get As?

I am current planning to go to pharmacy school, but I just can’t get As in my science courses. The only As I have gotten after a quarter at UCI is in writing, but writing has always been a breeze for me, but never was my passion. As for chem and bio, I’m always interested in these subjects, but when it comes to midterms, I just don’t do well. All the info from studying is all stored in my head, but once the test comes, they all jumble up, and I just can’t really connect the info quickly enough to finish the midterm on time.

So for of you who easily get As (with or without studying), how do you do it? Are there any certain study tips that I should be adopting? Also, do you think it is possible for me to boost my sGPA to 3.4 (it’s currently @ 2.65 right now) by the end of senior year? Thanks!