This is what I saw at Woodlands Int. moments ago.
When school reopens come 26th June, SMRT Route 900A will follow the
existing route 900, plus calling 2 at more new bus stop at
Singapore Sports School and Innova Junior College (both @ Champions
Way).
It will only be available on School Days only and at Peak
Hours.
This is not similar as 902 where the bus only calls at one bus stop
(ie Republic Poly, and is also not similar to many short trip
routes with an affix A.