They taught us that the fastest way to stop is to use both brakes together. Luckily for me the rear brake on the bike I got was adjusted a little loose, made it hard to lock it up.
Also they taught us to squeeze both levers and push on both pedals, at the same time. I felt that the harder I squeezed the brake the harder I squeezed on the already disengaged clutch.
Don’t know if this helps, good luck!