don't know specifically about Drexel, but generally tuition is charged by the semester, and FA is disbursed each semester as well. So if Drexel charges 38K in tuition/fees, that's 19K/semester. You applied for 50K FA, which is 25K/semester. Thus, you should get a 6K check at the beginning of each semester to assist you in living during that semester. It is up to the school (and you) whether you have them cut you an actual check or have the funds direct deposited into an account of your choice. Call the FA office for your choices.
As for what you do with that money, that's up to you. You can certainly put the 6K into a 3 month CD, but then if you need it, it's tied up and you're broke until it matures.