first u must understand...each school have different course offer to thier form 6 student ..not all student take mat t and mat LT together ..some do take and some not.. so the first syarat is u can choose which subjet from the 3 basic subject must be C+ ..after the first option u qualified then u move to second option but this time remove the choice u choose in the first option so u left onli 5 choice..if let say u chose mat t for 1st option then the second option u kenot choose mat t any more ...u need to have other subject C+ in the category beside the mat t u choose..so understand now

or -.- refer the upu qualification book mah ..i think they got write there