I was from SMK SS17. Most of the teachers there are amazing, their dedication unmatched so far to me

Particularly: Maths S & T, Chemistry, Accounts, Economics.
I have personally seen these teachers give extra classes, miss recess breaks to teach finish the lesson, clarify questions and get you reference on the next class, borrow books in the school library for you for reference, mark any extra paper you pass to them, (well, if you have already finished the mountain load of work they gave you xD which is enough to get A) They are all also very nice people
However downside is a not-so active student environment xD maybe you get more time to study haha
SMK SS17 also produced one of the highest amount of straight A scorers 2 years ago (my senior's batch

) in Malaysia
Another more reputable school is SMK Seafield. I wanted to appeal to go there initially but in the end i thought 17 was okay

and also i visited their school once before form 6 started and one of their teachers were extremely rude and sarcastic to me....so that sort of put me off (I took English Lit tuition though from one of their English teachers

)
Both schools in Subang