Hey Kamie22.
It depends on what you feel is best for yourself, whether you really like Further, how you view your maths skills and, most importantly, know this
isn't a prerequisite for your courses beyond VCE (do you need Methods in what you want to do after Year 12?*). I did General Maths (Further 1/2) in Year 10, went to do Methods 1/2 in Year 11 and then Further + Methods 3/4 in Year 12, so I can understand you concern. It wasn't too much of a leap; Further is considered 'easier' to many, but of course this varies a little between people.
Can you calculate a mean? Remember how to do linear equations? Understand some forms of financial maths and patterns? Then you're in good stead for Further. If you would prefer doing these over calculus and algebra (and don't need Methods for post-Year 12 life), then by all means, go for it and make a move!
Oh, question: what are you looking at doing after year 12? (What do you want to study/ do?)
* Don't know what your course prerequisites are? Check
here and insert your course/ area preference. Scroll to the middle for what you need to get into that course.
Note: PhoenixxFire beat me to it, but I left this here to break it down further (pun not intended).