worry about vectors (if possible try to learn and understand 3d vectors) not needed as you will cover 3d in unit 3 and matrices, also learn complex numbers. Other than that there isn't too much you need to focus on, don't learn the proof topic but make sure you understand the basics of it (Induction is pretty cruisy). In summary Vectors, Matrices and complex numbers are the overlapping topics. I am assuming you already did unit 1 and 2 of methods so the calculus should be fine.
if u got any more questions don't hesitate to ask.
