You run 12 at the moment. Training max velocity through flies should absolutely not be a concern right now. You don’t have a coach to monitor technique and you aren’t running fast enough to get any real stimulus from stuff like that. I’m trying to save you from wasting your time like many of us have in the past. Most of that stuff is fantasy land crap. If you want to do some max v work that isn’t just a short sprint, do some build-ups. Worry about flies when you have a coach that can give you useful advice.
I think you’re wasting time spending any focus on flies, SSE, etc. You’re 15, maturing, and still developing. You’re also training on your own. I am extremely hesitant to recommend you not compete at all for the high school team. That’s a very slippery slope and considering you have said that you have mental issues with competing, those are certainly not going to be adequately addressed by sitting on the sidelines.
The programs you’re posting are just not appropriate. Once again, what are the conditions like where you are and what access do you have. Is the weather terrible? Do you have a grass hill? Do you have a sled? Do you have access to smooth, consistent grass that’s good for sprinting? What about turf?
I would probably simplify your plan into 2 days that you alternate as much as possible, resting when needed:
Day 1-Acceleration and short speed development. Runs out to 30-50m. Total volume 300-600 depending on surface/type/etc. I would prefer to stick with hills initially (4x4x30m or 3x5x40m or something like that) and get up to doing 4-8 x 50m from different starting positions. Vary the rep distances, recoveries, surfaces, etc. Just make sure you’re putting in the work and monitoring the performance is steadily rising.
Day 2-Extensive tempo. 1000-2000m total with a variety of rep distances and speeds(100-600m, maybe out to 800m even). General strength, core, etc. exercises can be done in between reps. I wouldn’t even bother timing these (although certainly vary the speed and challenge yourself) and I wouldn’t do them on anything other than grass/turf/or treadmill. Some days you could do something fast and light–maybe 8x100m in 14 on grass or turf with just a walk back and other times you could go more volume, maybe 4x400m in 75, walking 400m rest or 10×200 as mentioned or even 3×800 @ no time (this will self-regulate, trust me).
You could put your weights on either day to be honest and I wouldn’t worry about doing extremely heavy loads. Compound exercises with good technique, moderate volume and load, working to progressively overload and increase the weights steadily and consistently. If you aren’t seeing progress week to week, month to month, then something is wrong.
At the end of the day, all of this is pointless if you aren’t competing. I would try to at least find a decent club coach in your area for the summer time.