What do you mean by rare? Those books are fairly common. You can try out by visiting your nearest public library. I'm sure they are stocked with various STPM and A-levels Maths books. They will surely have a copy of the STPM text books. Or the best, Just take a look at what the form sixers are using
I borrowed a few texts from my teachers at school to study for my SATs. I was handed 2 Pelangi books for Mathematics. The first one (red in colour) was the general Maths - both Maths S and T students will have to familiarize themselves with the topics covered here. The second book was for Maths T Paper 2 I believe. Its green in colour
Or, if everything fails, just search them up on the net like I did
theres tons of info out there just waiting to be accessed!