To give you a better sense of how your current background might compare to the curriculum at a German university, here’s the suggested sequence of courses for a Bachelor in Neuroscience at the University of Koeln:
Neuroscience Year 1:
Organic Chemistry, Statistics, Physics (a review of AP physics C, essentially), Neuro-Anatomy, Neuro-Physiology, Cognitive Science (with an emphasis on research methods, including imaging studies), Zoology and Evolutionary Biology, and a hands-on seminar on live animal research (how to raise, dissect, image, draw blood from… a rat)
Neuroscience Year 2:
Biochemistry, Developmental Neuro-Biology, Human Physiology, and a full-time semester-long internship
Neuroscience Year 3:
Pharmacology, Neurological Diseases, Cognitive Science (with an emphasis on learning and memory), a choice of seminars taught by graduate students, 2 electives for relevant professional skills in other fields (e.g. computer science or a foreign language), and writing a Bachelor’s thesis
http://www.neuroscience.uni-koeln.de/22303.html
http://www.neuroscience.uni-koeln.de/22302.html
Most American undergraduates would not cram that many courses from a single field into their schedule in the first 1-2 years. That’s why the standard advice is that American undergraduates should expect to start their degree from scratch in Europe. On the flip side, American colleges are famous for their flexibility and some students may be years ahead of the curve. Maybe you’re one of them?