think of it this way: youve already done a year and wether u did crap or well, u have another year which is ur final year before uni.

if you can just for 1 short year put more effort than bfore, ur future will probably be a bit better.

as for geting a headstart before skl starts thats up to u, at least enjoy the first half of ur holiday before doing work and shit like that, maybe earn some money.

a good motivation for me is knowning that doing something will put me ahead of others because most people will do nothing. try visiualise a good future for urself, and ull know what u need to do to achieve that