I had used it before and it actually cost you nothing.No written exercise inside and the exercise inside is available on many reference sold in the market.As you know,for most of the children,when you ask them to do exercise,they will instead playing games when you didn't noticed them!My advice that it is more worth for your children to attend tuition or just buy some reference books for your children.Furthermore,the exercise inside the portal can be easily outdated!If you want it,you can directly get the syllabus from the lecturer or examiner who wrote this programme,they are from USM.