Failing first year of uni with ECs??

I am in my first year of university and had missed my summer exams due to personal reasons. I submitted ECs for this which were accepted and my exams got pushed to August. However, I still feel unprepared for them and am likely to fail as the situation hasn’t gotten any better. Has anyone been in this situation before and what were the outcomes? I really don’t want to resit the year because i already feel so far behind and feel like it would make me more overwhelmed.