Kavya It's definitely not ideal to get behind in methods or in any subject for that matter. My advice is to create a list of all the chapters/topics that will be assessed on the SAC and assess your ability on each particular topic. For each topic identify if you know it well, know a bit, or know nothing at all. Given the sense of urgency in the fact that your SAC is in 5 days, start by revising the topics you know nothing at all about. My advice is to do practice questions on these topics, whether that be working through as many textbook questions as possible or doing practice SACs, notes are not beneficial at this point. Start from the basics, assess your knowledge for each question type and then build up from there. Then, if you still have time after this, go on to the topics you know a bit about and do the same. You're going to have to work efficiently and work hard. Assess what is not worth your time to revise and what is.
It's definitely possible to get a decent mark on the SAC, you just have to identify which topics/chapter are crucial/are going to be heavily assessed on. Is your SAC worth 40%? My school's is worth 20%. Either way, if you fail this SAC there is still opportunity for redemption, as you said pick up the rest of your SAC marks and do decent on the exam. The exam has the highest weighting and if you do well on it, it can bring up your SAC scores.