Studying Chemistry Degree

Hello everyone, i'am actually an international student in canada, but i'am not studying what i want because it's too expensive for now, but i'am planning to study chemistry degree later in 2 or 3 years, so i have like 2 years to prepare my self to take this degree, so i'am wondering how can i start studying on my own the chemistry degree because i have 2 years and i dont wanna spoil it, so i prefer to be ready, so the question is what can i study alone at home, and how can i do that ? because i dont really know what's on the program, so i need help please in order to know where should i start and with what books etc... 
Thanks.