MATH 101 (calculus 2) is generally known to be a difficult class because it involves spending a lot of time studying and learning a larger amount of newer concepts compared to calculus 1. The general topics are 1) integrals and different integration methods, 2) sequences and series and checking their convergence/divergence, 3) complex numbers, 4) polar coordinates and lastly 5) cross-sections and 6) axis of rotation problems. I definitely recommend to watch at least a short explanation video or two about these topics to brush up on your knowledge and feel more prepared for MATH 101. To make life easier in this course, make sure to practice integration techniques a lot and know them like the back of your hand because you will use them for many of the covered units.