I didn't do spesh and have nothing to do with anything maths-ish, but I see in this an opportunity to get on to my hobby horse: don't do something just for scaling!
I got a far better score in HHD, a notorious down-scaling subject, than I could have got scaled in Spesh. If I were to re-select my subjects now, with the aim of getting the highest ATAR possible, I'd locate all the 'easy' subjects like say PE - as long as you don't take an easier subject as a bludge, you have a higher chance of getting a really high score, especially as you're likely to have less competition and also to have more confidence. (And I promise, it's way more satisfying getting a raw high score than a scaled high score

). But most importantly, it's way more satisfying doing a subject you really enjoy, and you'll be far more motivated to study for it and get a good mark. So obviously, if you love maths, of course do Spesh. It's just you sound a bit doubtful that you'd enjoy it. Are there other subjects you'd like better? Go for them.
My older siblings all killed Methods/Spesh and were shocked when I told them I wouldn't do Spesh and that I was going to prove that someone from our family could have Methods as their bottom score... they said I was wasting myself. But I equalled their ATARs and I'm sure that I enjoyed my year more than they did. Please do what you want. It really doesn't disadvantage you, ATAR-wise.
</rant>
P.S. You briefly aroused hobby horse #2 with your comment that others have 'already started prepping via tuition'. Year-long courses were meant to take a year, right? ... hey actually, why don't we start prepping kids for VCE subjects in
primary school kinder??
P.P.S. I don't think I've actually answered your question at all. I blame you for getting me started

... Anyway, read this summary:
Re: An overview specialist in basic terms., I think you're going to be in the new study design by 2017? (uncertain)
P.P.P.S. To clarify, I'm not against Spesh at all. I don't have a clue how hard it really is. I'm just against the relentless focus on 'scaling' and 'hard' subjects.