Hello. I have a question regarding letters of recommendation. I know that all med schools want different types of letters (i.e., letters from 3 sci profs, or 2 sci and 1 humanities, or 2 sci and 1-2 'professionals') So I have asked 3 science profs for letters as of now, but I don't know how many letters I'll need from each of them. My question is: what do I tell these professors when they ask when I need them by? Is this made clear when I receive my secondaries or do I need to call each school and ask?