Find out what the rules will be for the group too, Like are they allowed to go off on their own, or check in at certain times?
It's hard, but if he can get up early, that'll help a lot with Hagrid's especially. Hagrid's seems to keep the longest lines during the day, vs Velocicoaster. We did 60 mins for VC one afternoon, but line keeps moving along. wasn't that bad of a time. VC and Hagrids dont' take express, so lines move steadily if ride is not down. Plus he'll be w friends, which is more fun/tolerable.
Hulk. Spiderman, FJ also must dos at IoA, At US, Gringotts, Simpsons, MiB. Rip Ride Rocket has insane waits all day. Super fun since you get to choose music to listen to while on the coaster, but long lines. Several rides are simulators, than can cause motion sickness tho. Even my son, who rarely get motion sickness, had a little bit on FJ.
And they will get soaked on Ripsaw falls, so may not be good if they dont' have something to keep phones dry.
Bus drops off at City walk, go through security there, then walk to either US or IoA
we had some good luck w single rider lines, but not all are open all day, they open and close them often. Like at MiB, we used the Sr line, then went right after to do it again, but it was closed...
Did SR at Gringotts, but you'll miss most of the queue. but I'd say we waited about 35 min. I think the regular line was either 60-70 mins.
Hope he has a wonderful trip!!! we are just back from a trip, and teens loved it.