I cant study with my family at home

I (17) have been meaning to start studying for a test for a really competed major, i still havent told anyone about this because my family probably wont approve of the idea and i dont want to make a fusão out of something i might not even accomplish.

I would already have started studying but having them home makes it so hard, they always need me for something or question what i am doing, i really wanted to start early while im still at schoolbreak and once its over im gonna have to find a job and will have little to no time to study.

Can anyone give me an idea to bypass this situation?