HKS Hi, I would recommand Spesh 3/4. The content is not very hard plus getting a 25 is very simple in any subject because you can make a number of mistakes and your rank will still be quite high. In contrast, yes perhaps general maths is slightly simpler, but from my expierence people said its actually more diffcult as you'll have to deal with a bunch of worded problems and you have to rank highly, which means its still a challenge. There are always people who tries hard in any subject, so if you choose general, you are competing agains those who try hard and if you do spesh, you'll be competing aginst those who don't bother to do any work so as long as you put in a little bit of effort you can score better.
Also, have you texted me yet? If you are interested please do so soon, otherwise I might run out of time as a number of other students are also requesting for tutoring.