whoawhoa & macca1234 :
good to read about youngsters like yourselves coming in to the sport and putting in the miles.
It's great to read it.
Advice ?
As regards training, you both seem to be dedicated and you're both getting the distances in.
I agree with the advice already given - ig you enjoy training and it doesn;t interfer with your studies, there is no reason why you cannot put in more miles per week.
I do think that you're doing plenty as it is.
For me, i found cross training beneficial : as well as getting the miles in, our team did gym work (situps, pressups, indoor football, very light weight work)
during the winter.
This helped to burn the calories and it broke up the routine of miles.
Progress in this game is slow - and sometimes you feel you're getting howhere
despite putting in the effort.
But believe me, as a guy who had only moderate ability, I worked and worked and managed to cycle at national stage race level.
The only surefire way to improve to stick to the miles and watch what you eat and try to avoid the temptations of teenage life (like alcohol).
It isn't easy and you need to be dedicated.
Good luck to ya.