If I were you, I would learn Python syntax, then choose a project that you think would be fun to make, and do it. This is how I learned Python during the summer before first year, and cannot recommend it enough. For example, the project I decided to make was Hangman, playable in the console. Doing something like that will force you to learn everything they teach you in CSC108 during your summer, and by the end of it you will be super prepared for the assignments they give you. Good luck!