You probably do not need biology specifically as an EE major. For an EE major, chemistry may be required, or science electives may be specified in addition to physics.
If you only earned a 3 on the AP calculus exam after C grades in the course, you are less likely to be ready to start in a course more advanced than calculus 1 (compared to someone who earned a 5 on the AP exam after A grades in the course). After you decide which college to attend, try the old calculus 1 final exams to check your knowledge. If you do start in calculus 1 in college, you will likely have to defer starting physics until second semester or quarter, since calculus 1 is typically a prerequisite to physics 1.
It will be a challenging course load and you will need to be organized and diligent. Attend tutoring and professor office hours. Do not get behind or ignore difficulties. Spend the summer prepping or taking a prep class. The pace is faster in college and the material is a deeper dive.