You should only ever take classes that:
1. You are genuinely interested in
2. Are required for your major/graduation
3. Will help boost your GPA and BCPM GPA.
Ask around and see if you can find any information regarding the difficulty of your classes. Check out Ratemyprofessor and select classes that you think you will be able to succeed in.
Kevin W, MCAT Tutor
Med School Tutors