UF Holistic admission weights about 50% of the application based on academics and 50% based on nonacademic items. See table C7 in the common data set.
http://www.ir.ufl.edu/CDS/Main_cds2016-2017.pdf
On academics, what’s most important is your GPA, class rigor, and application essay (this essay is IMPORTANT), while ACT/SAT is not as important.
http://www.alligator.org/news/campus/article_e584a33e-f067-11e6-a022-276a54ba0335.html
His GPA and class rigor look great. Make sure he puts some work into that essay! He may want to re-take the SAT, UF will superscore his SAT scores. They want the final SAT scores by the end of December (the application is due on Nov 1’st).
The other items are nonacademic. Most importantly are extracurricular activities, and volunteer work (see table C7). Also important is work experience. UF likes to see a commitment to ECs, etc. It’s better to be committed to a few, than spend little time on a lot.
His EC’s look Ok. This would be a good summer to add to them, either by working on some ECs’ (they do not have to be school related), doing volunteer work, or even just working a summer job.
Not as important as ECs, etc, but still considered is the level of applicant’s interest. So going to UF and taking an admissions tour is a plus.
Good Luck!