Hi Amelia!
I just wanted to clarify that subjects are actually not scaled according to how hard they are, rather the "competitiveness" of the cohort. For example, the cohort for maths methods is usually stronger than the cohort for theatre studies, therefore methods would scale up. This can actually change between different years, however, it usually stays relatively the same.
In terms of easy subjects, you are correct in saying that there are no 'easy' subjects. All subjects have challenging components, whether it be the difficulty of the content, amount of content, or just the competitiveness of the cohort.
In my experience, I have found further maths to have a lighter workload than most of my other subjects. However, I would not recommend this subject if you are doing both methods
and specialist, as only 2 maths can be in your top 4. I would recommend choosing subjects you truly enjoy, as these make studying not feel like studying. Also making sure to fill university pre-requisites
If you have any other questions, feel free to post them here or PM me