To add to ZZ's last post, many college sports people have to maintain a certain Grade Point Average, their leagues demand it.
On academics DS, who is in the US as a Graduate student, initially found the US way of studying with exams every few weeks unrelenting. There was no let up. Marking was way higher. I congratulated DS for getting 98% on one test, and he explained that it was very possible for the rest of the class to get 100% leaving him with a low grade that might impact on his GPA. If he is required to keep up to certain academic standards, it is worth your DS being diligent, at least until he understands what is required.
DS got a Monzo account which he used until he was able to set up a US bank account, but as a graduate student he had quite a lot of initial expenses around renting a flat and buying furniture. Your DS might not need it.
I remember the visa application being a nightmare, though I have forgotten much of the detail. The sponsors letter is of limited duration, and so expired before DS had completed the process and had to be reissued. (The same thing happened when DD needed a visa for CampAmerica.) The US can be picky about passport photos and eventually we used one of their recommended photographers. In normal years there can be a delay in getting a visa interview so it was wise to apply early. You also needed to ensure that you noted down the visa application number if you were not able to complete it in one go and needed to access it later.
The visa guidance DS got from his University was not great, but I googled and found another University which had useful advice online. The CampAmerica guidance, which may also be online, about visa applications and interviews (it was the same category visa) was very detailed and we reread it for DS.
DS did the health stuff himself but I remember a bit of a paperchase, and needing either vaccinations or having to contact the GP.