Good enough, if you follow your plan.
I don't know what 6/10 or 7/10 effort mean to you, but as as junior in HS, the long run should not be slower than 7:30 pace, and if it is, find a mileage that you can run 7:30 pace. Once 7:30 is the slow pace for your week, then work on getting under 7 min/mile pace for all your runs.
Once everything is under 7 min/mile pace, use that for the long run (Saturdays in your weekly scheme), and start getting your 4 mile runs closer to 6;30 pace.
Also after 3-4 weekly cycles, you probably will cut back on the 4 x 800m by eliminating the slower two efforts, and keeping the last two faster efforts: 2 x 800m.
What I am saying is no training should be slower than 7:30 pace, especially as a varsity runner.
If you were a 3200m varsity runner, it should not be slower than 7:00 pace, and then no slower than 6:30 pace once you've trained a few weeks.
The 4 mile runs should be at least 7 min pace, and once there, move to 6:30 pace.
Slow running does nothing except maintain some level of fitness for substandard athletes. That is why so many 30s, 40s, and older runners love it. The older they get, the more likely slower running actually benefits them.
Run faster than 7:30 pace or go for a brisk walk. The mileage is less important than the pace.