the biggest problem is that the one extra unit that ext 1 english gives you basically has 2 units worth of work (let's say compared to business or legal)
trust me, 3u english is a lot of work
so two units worth of work is only yielding you one unit in result in 3u english
the other factor is 4u maths --> obviously it scales well...
but, if you do 4u maths, ur 3u maths automatically goes from 50 to 100 (think about it, even if you get zero for 4u, ur 3u marks still automatically double) --> this is honestly rlly stupid. + it scales rlly well as well
to be fair, all extension courses apart from maths is objectively (i don't care whether u like it or if ur good at it --> just ROI + scaling) not worth it, for the reasons stated above (result on investment --> two units of work yielding only one unit)
going back to maths, 3u english is not worth it objectively because of the existence of 4u maths (its stupid scaling) and ROI, and I feel like 3u maths + english is completely not worth it because you are doing 8 units of work while only yielding 6 units of work + ur missing out on the 3u double mark if you do 4u maths (assuming u do 2u english + 4u maths --> which is the choice among top achievers)
here my two cents, pls feel free to disagree and we can explore this explore down in the thread!