I 100% agree with Orb, Sine and Calebark. I did Further Maths but did not get a 50 - to get a 50 in Further Maths you will need to full mark both exams, which is very difficult to achieve. So Further Maths is not an 'easy 50' at all, and in fact there have been cases where students achieve a lower ss in Further compared to Methods simply because each mistake in the Further Maths exam costs a study score.
Another important thing to note is that Further Maths focuses on very different areas of maths compared to Methods. In Methods, you don't cover statistics in a lot of depth, but stats is a core module in Further. Financial maths is also another core module in Further, and many students find financial challenging because there's so much terminology and you have to apply the correct formulae to problems. Even as a person who is strong at maths, I found the financial maths section of Further took me a while to wrap my head around, because it was conceptually challenging. Other modules such as linear, geometry, matrices and networks are also not covered at all or in depth in Methods, and sometimes the questions you do in these topics can also be relatively difficult too (especially for geometry).
Personally I wouldn't believe it when people say 'Further is an easy 50'. Yes, Further is overall 'easier' than Methods because the questions you are tested on are relatively clear and easier to understand. But no subject is easy, and to do well, you have to put in a decent amount of effort.