But at the same time... if you're already struggling with Methods.... I know there's time to sort it out but not doing Methods is not the end of the world - you can do bridging courses and subjects at uni.. perhaps for you, that might be all it takes.. completing the methods equivalent outside of the pressurised school environment.
You're going to get significantly skewed opinions here due to the vast majority having completed methods and favour it over Further. Obviously i'm not saying give up and ditch Methods, i'm just saying if you should feel that you can't continue.. it would only be a bump in the road to your future success.
Personally it took me until I left school to get my act together and focus - the adult environment may surprise you once you get there. I only did Further and sure it wasn't ideal, I was able to do the methods equivalent part-way through my course and had the option to transfer into my desired course (I opted to stay).
I would be having a chat with your family, teachers and career counsellor at your school - they are best informed to provide you with the advice you need based on your future career objectives, rather than a bunch of strangers who have zero context as to you, your objectives and current performance. Of course, if your future pathway requires methods as a uni prereq, then you'll have to weigh up whether you are OK with doing an extra subject (or additional time) at uni to cover the requirement as a bridging course/subject or whether you want to stay with methods.
If you dislike the subject and aren't doing well because of it - then I think you're already 50% there towards your decision.