Dining halls close at 10 PM. Currently, registration is open (for me at least... IDK if it is for incoming frosh). So, tell him to go to
https://oscar.gatech.edu/pls/bprod/twbkwbis.P_ValLogin login w/ his GTID number, which is printed on his buzzcard, and password (which i believe is originally his birthday if he hasn't changed it). Then go to Student Services and Financial Aid>Registration>Add and Drop Classes
Then, look through the options... chem still has some labs open, so he should be able to switch... may require a switch in class section, though. Oh, when you sign up for Chem 1310, you have to pick a lab with the same sec letter in front of a number (so, if you're in chem1310 "A", you pick A1, A2, A3, etc.. for the 0.0 credit selections) So pick two checkmarks in Chem 1310.
Math 1501 (Calc I) still has sections open. You only have to pick one checkmark for that one, but there will be ttwo times listed: one for lecture, the other for recitation.
If it's not open, which I believe it will be, then there will be one more Phase III registration during the first week of classes. I hope I was of help to you!