First time motoring.

[Ridgey0101]

I'm 16 I was was wondering about the can't test I would have to take to be able to ride a moped. Over the holidays I was thinking of doing my Cbt for when i go to college but I'm going to turn 17. My question was can you do your cbt at 16 then ride 125cc's at 17 or would you need to completed another cbt?