Honestly speaking, I don't think there are any good GMAT prep courses in Singapore. I'd tried Icon+, thinking that it is the best available in Singapore. Unfortunately, it offers below par quality. At the time I'd attended Icon+, it did not have it's own mock tests and sneakishly created my account on Manhattan GMAT
for me and bought the 6 mock tests @ $39. before I signed up for the course, they kept saying that Icon+ has its own practice tests etc. Their class room materials and trainers are also below average. In short, please don't waste your money and time at Icon+ in Singapore. It's not worth it!
I recommend you try the online courses such as Manhattan GMAT
... They offer great materials, recorded sessions, and live sessions. All their trainers are really good. These courses cost much less than courses (Icon+) in Singapore, but they are really worth your money and offer great value.
Best wishes and good luck with your prep!Posted from my mobile device