I know evaluating can be the most frustrating part, especially because it's marked the most subjectively, but try to look at its positives: it's one of the only parts of the course that has NO "required" content!
In other words, you can write ANY strengths and weaknesses that you like, that you know you can explain well, that you personally agree with - and use ANY examples or evidence you want to back it up - and you don't have to worry about wording it the same way as the examiner or covering "required" content or keywords.
Evaluating and comparing are the two parts of the course where this is the case, so just read as many strengths and weaknesses from other people as possible, then be like a magpie - pick out all the best one, the ones you like and agree with, and start every question on the topic with the ones you feel most confident on.