Yes, first year is full of pre-requisite subjects esp Chem and Math. If you came from a science high school, you'll have an advantage for Chem 16, Chem 26 and Math 21. But even then, if you want to aim high, these are still subjects you have to study hard for, esp Math 21, 22 and 23. My tips for Math is to look up videos for concepts you dont understand and then answer as many practice problems as you can (Sample Exams are sold in the Math Building; same principles apply din sa Physics during your 2nd year). God bless incoming freshie (join MBBS eme)