Aos 1 is done and dusted. Do not waste time and go over the content again at all. Aos 2 is approaching, and you say you want to attain better SAC scores this term, then what's the point of going back to Aos 1 work, that won't help you for next term! So my word of advice is, get ahead. Even if you don't understand everything that you do whilst getting ahead, you are still exposing yourself to the type of content that is upcoming, that is, you are preparing for what might come in SACs earlier, so you have more time to ask the wonderful threads of AN, teachers (this would be my last resort) or peers about anything you are not 100% certain in (content wise). For example, I am currently doing limits and gradients in methods (getting ahead), I understand about 75% of what I'm doing, but Its okay, because when I redo it with my class I will probably help some people (which solidifies knowledge) and I can ask questions in class. That being said, you should never feel discomforted if you don't understand what you are doing whilst getting ahead, concepts and theories do not click in instantly (unless you're someone like lxznl or some prodigy like that). Give the content some time, and I promise you will understand it eventually!
So to wrap it up, don't worry about last term, try to get ahead as much as possible, even if you are not understanding everything. This is a new term, a new start. Go get it!

<3
Cosine