I was in Sunway, Sunway's an excellent choice to do your A-Levels. The facilities are awesome, good teachers (for me) and good crowd. You'll do well there with some self-discipline.

Can I recommend KYUEM?  I'm there now sponsored by JPA. It's not that good as Sunway since it's a boarding school. The internet here sucks, yellow water and the teachers are slightly above average only. But I find at KYUEM the sense of community which is quite lacking in normal colleges. It feels awesome to watch football, to play sports, to play pc games till the midnight, to study, to eat, to simply do EVERYTHING with your friends every day. 

Fees are quite expensive at KYUEM though, 50~60k for 2 years coz it's a boarding college in the jungle.