I trained my college roommate for a nfl tryout. Speed you can't teach you have it or you don't. I wouldn't focus on the things you really have no control over. I didn't read really thorough, but I'm not sure what position your trying out for. Slot or db I'm guessing by your body type. You can get stronger, you can work on your hands, you can work on your route running so on so forth. At your age i would focus on the one or two things you do really well and improve on those. You don't really have the time to become complete.
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