Pana97 because I do coach for a premier league academy ,my advice is listen to the above advice from Greekaus and Athinaios and also PAOmelbourne.
It is extremely competitive out there in the football world,it is nearly impossible to get a trial with a premier league club unless you have been capped by your national team at youth level or been personally scouted by one of their top scouts .
A lot of these academies are just money making exercises that promise a lot but deliver nothing.
One kid came to me and said he got a trial from his academy with a top Italian club and I said to him that's impossible,because I know for a fact that that the young players of this Italian club 70-80 of them are locked away and no one goes in or out,and I was right the kid got ripped off.
focus on your education which is what I tell all my players,and make sure you are getting at least 15 hours of football training weekly.
and don't give up at the first rejection keep at it and work hard.you might not play at a top level but you might end up making a living from it.but have a back up plan.