I paid about $60 for a set of primary 2 exam papers. It is for my child to practice. I also found another resource for free test papers at https://tutorfirstclass.sg/free-test-papers They have mostly primary school and across the subjects, but only the top few schools.

LKVM:

How to get that stats from MOM site?

You can go to MOM website (https://services.mom.gov.sg/eadirectory/#) to filter the Agency according to the ratings, retention rate. But maid agencies can be more complicated. Some only specialize in helpers from certain country. So it's always best to pick a few to compare.

Another option is to search the Agency based on their specialty (http://helperadvisor.com/singapore-maid-agencies/), then compare their MOM statistics.

Hope that helps!