I think it's a positive that GSIS does not do IB "at the moment"...when you hear of the problems the other schools are facing as a result of it. Who wants a "school certificate" if you don't get your IB.
GSIS gets wonderful A'level results and more than their fair share of Medical and law students at University...the proof is there...they nurture their students and get the results.
Sadly their parents too have been lured by expensive advertising campaign of IB and are changing to IB in 2 years time - when other schools would prefer to turn back!!!