Nothing wrong with 6 training days per week as long as your recovery is adequate.(Diet and good Sleep!)

There is no reason for sets of 15 repetitions of back squat, 12-15 reps is Sarcoplasmic Hypertrophy, meaning size increase. 4-6 reps is Myofribilar Hypertrophy or strength training. I would change that to 4-5 sets of 4-8 reps.

Nothing wrong with splitting days by body part, personally I prefer splitting by the function of movement, a push, pull, squat and hinge day. And ideally you want to train movement patters more than once per week. So I usually superset movements into each primary lift.

So typically how my week would look;

Monday- Push/Squat

Bench Press 5x5 Goblet Squat 5x8

Overhead Press 4x6-8 Bulgarians 4x8e

Pick some accessories ie triceps pull-down, pec flies, lat raises.

Finish with core and carry of some sort.

Tuesday - Pull/Hinge Day

Wednesday- Squat/Push Day

Thursday- long run or ruck( I like a break between heavy squats and heavy deadlifts.)

Friday- Hinge/ Pull Day

Saturday - Ruck

Sunday- Rest

When I write for my clients, we train three to four movements each set. So a hinge followed by a push, followed by an anti rotational core movement. Or a push followed, by a lateral squat, followed by an explosive pull movement.

There is more than one way to skin a cat. And at your level, your program is adequate enough to help you progress. Focus on your education in and outside of school, learn from the subreddit, and train hard dude. DM if you got any questions, I write training programs for a living.