mizuki i currently go to year 8 special classes @ NQT, but id argue just looking online for sample tests would be much helpful, just revise the year 8 math curriculum, expand ur vocab by reading and just finding websites that teach new vocab. As someone who did go to the same tuition for years, i think you should be slighty set, though i wouldnt depend on it & would try to study as much as possible, unless u already do well in school & r confident in performing above your cohort (if there are others trying out).
ALSO! i read ur only trying out for macrob, but id still recommend trying out for other schools like nossal, as you can always decline offers to other schools if u still don't want to go to them! :