How to balance school and training?

I am a young cyclist who is suceeding in the sport and I have high hopes of making it onto an NRS team. However, I am currently struggling to balance school and my training. I aim studying to be an engineer and with my HSC course about to start. (year 11 and 12). I live far away from where the rest of my cycling squad train and often ride and train on my own. I have tried many times to try and make a program but I'm not sure if it is balanced. I don't really have friends at school, just people I interact with. My main friends are in my cycling squad. I just need advice, maybe a sample plan on how to train. I am a 16 year old female, excels in road hill climbs and MTB. Don't have much strength on the flats and I really want bigger, stronger muscles! (Yes! I just said that!)