Hey man, always refreshing to see someone so young that has the drive to follow a dream and make this new sport their life- and it shows in the time spent getting into these different forms being offered to you! So kudos to that!
While I'm by no means a expert/trainer as I've been involved in MMA for a short time...however, I hope I'm not reading the schedule you posted as what you're ACTUALLY doing- just what's available at this gym...by no means am I trying to discourage staying active, etc. But that seems rather excessive for a 15 yr old....
At any rate, my personal opinion would be to pick a couple styles; especially BJJ, MT, and Wrestling. Simply because, obviously with BJJ you're getting your GnP, etc. So you'll be good on the ground..and your MT would eliminate the need for the Boxing and Kick Boxing, as well as make you an effective stand up fighter...finally I think having some wrestling skills would just benefit you in giving you an all around mix of styles. I'm doing Hapkido, BJJ, and Muay Thai--wanting to pick up Judo later on just for the hell of it--I also wrestled in High School...
So just focus more time in BJJ/MT/Wrestling and that should be a good starting point...and if you feel inclined to mix in cardio/weights throughout the week. Remember your body is going to need off days to recover!! Just train hard and keep your diet squared away...that's about all I can think of--you've definately got the drive, determination, and heart; and that'll take you far in itself!
Best of luck in following this dream! Welcome to the forums..and I'm sure more veteraned members will give you guidance as well--I'm sure it'll differ from mine as well.

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EDIT: If you REALLY wanna try to learn all those styles at once feel free! Not trying to stop you or anything as you need to be well rounded to counter your opponents styles but it really seems like MT would cover you in boxing/kickboxing....sorry for the rambling...MT/BJJ/Wrestling just technically would make you pretty well rounded both offensively and defensively...