i never go above 8 reps for squats, and this was months ago, and i would only do one set at that many reps. 8-12 reps would be for other supplementary exercises like rev hypers, calf raises, rdl, etc. any big power exercises (deadlift, squat, olympic lifts, bench) i prefer to never go over 5 reps
for upper body lifts i do almost all lifts besides bench and sometimes row in the 8-12 range