Presently, I am following three paths of studies in Maths at the same time. 1. elementary Set theory. (College year 1 level) ( I just started.) 2. Calculus (High school level) ( I am almost finished 2/3) 3. 3-D vectors ,Matrices and linear algebra, complex number. (high school level) ( I just started) May I have your suggestions, please? Thanks.