Er? I really don't see any point taking 5 subjects other than for self improving/satisfaction purpose. Yes, it'll be a really big boost(for scholarships) if you can get 5 As. If you don't have the confidence to do that..DON'T.
But i have to admit that getting 5As is gonna be a killer and worth a praise. But that's all. In another words, it's quite pointless infact it might drag your other 4 grade down. What if you end up with 4A and 1C?
It's the same with SPM, 10A1 1A2<10A1 which is absurd

I don't know about other schools but mine offered computer..It's Malacca High School.
An easy subject(I heard) might work like an intro if you r into IT.
Anyway, as an ex-STPM student..I say take up subjects like maths.
It might be required for certain courses in IPTA unlike History, Business, BM, etc.