First, I would like to congratulate you for looking into these two very promising concentrations. Let me begin my advice by first emphasizing the importance of time management. At the collegiate level, there's a great deal for self discipline & goal orientation to keep you focus. This includes specific hours & days during the week where you will only dedicate time to get your work done. Secondly, developing a relationship & partnership with your Biology department & key personnel like your instructors & academic adviser. They are incredible resources to acquire information & knowledge on the subject to help you navigate the courses accordingly. Since both are different subjects but housed under Biology, I suspect an approach to recommendations will be taken to meet the requirements of both subjects. Third, if you find yourself needing academic assistance i.e. tutoring, those are resources you can always count on if you meet an obstacle along the way. Finally, patience is important in maintaining a realistic & manageable outlook on the subjects that need more time adjusting & spending a great deal of assistance.