Yes I heard of it. You can also find some good agency here: https://sg.theasianparent.com/best-private-tutors-in-singapore/
I am looking for a home tutor for my 8 yr old sister who has trouble coping with P2 maths and chinese. really horrible. Gt 50+ only for these 2 subject. I did sent her for group tuition but not effective leh. Then i tried agency like a-star (no reply) and manytutor.com (the tutor always late) . Hope to find a home tutor directly or find a good agency. Any to recommend?