OP- you need to chill out. Your child will change/grow/mature so much in the next few years. Those “long” tests you are obsessed about will be useful later. Stop obsessing!
Public flagship U’s are multi-tiered- they accommodate the gifted and other top students along with more average college students. Think Honors programs/colleges.
Eventually (in HS) you will want to see how your child performs on those dreaded standardized tests (ACT/SAT et al). They do not measure how much test specific prep work is done- the best students will have learned the skills and materials in their classes. Many of these students merely go over a practice exam (sometimes under duress) and get top scores. Some parts of the country seem to have more students who spend far too much time prepping for them.
Discuss your child’s progress at parent teacher conferences and with the guidance counselor. Relax.