Best of luck with the remainder of the selection process.
However, the fast track system from SAC assistant to Sgt controller is being scrapped!!...........in favour of a system similar to that of direct entry SNCO Aircrew - direct entry SNCO Air Traffic Controller. There will still be the current system of joining as an assistant, working your way through the ranks and being selected for controlling as a Sgt.
And you could always consider joining as an Officer. Or joining the ranks and go for a commission later in your career.