Are you taking Chem and Bio at the same time? Two lab sciences at once is tough .
One way to do it is to space them out.
But yes, you have to be able to do well in science for pre-med.
I would talk to your adviser/Health major adviser asap.
You DO NOT WANT D’s in both of these classes in your GPA. One possibility is withdrawing from one of these classes. But make sure you are still full time…that affects your housing/financial aid.
Another is to raise your grad! You need to change how you study…get tutors! Here are more ideas: