Kowloon Tong MTR Exit A2 to Mongkok way through Waterloo road, walking distance around 8-10 minutes, Alliance will on your opposite side or Exit E, take minibus 25M, ask driver to drop you off in the nearest street for Alliance. In my opinion, better walk there, not that far.
My friends go there at around 9:15am and finished it before 10:00am. She has there has many people and the queue ended at "ho tong road" but the school is very efficient!