Well, hi, I'm not sure whether I have it or not, but I'll describe my problem as close as I can. I will do it by presenting my normal everyday day plan.
I wake up at 6:00am.
Do some exercises (30 sit ups, 30 push ups), then take some fish oil and polyvitamins (contains all the vitamins that are recommended and also metals like MG, Zn etc..). Then I go take a shower and eat (porridge normally). Then at 7am I start go to school. School starts at 8am. When the time gets around 12am-1pm, I feel I'm getting tired and can't concentrate on studying anymore. Also at 12:25 I go eat school food. Around 2-4pm school ends and I get home 3-5pm. Then I'm completely exhausted and therefore cannot study for the next day and also I don't think it's good to go bed that early around 6pm, so I go around 9-10pm, sometimes I've been even 8pm, but still no results next day, I'm still tired as hell.

So, is there any way I would gain more energy, because atm I'm just wasting my precious living time? Thank you!