It depends whether it's a fast corner or slow. If it's a fast corner, initially (if your new) you can turn without braking and maybe lifting of your foot from the accelerator as well and as you progress on the turn accelerate. And later on you can throttle your way out if you have the confidence boosted in you.
Slow turns, jump on your brakes, you must be able to hear the sweet sound of braking.
1
Simple rule for turning: Slow into the corner and fast out. This would help you a lot. If anytime your kart starts to skid, steer in the opposite direction.
Try that racing line and let us know about the change in your lap timings.
Cheers
Racing cars are neither beautiful nor ugly, they are beautiful only when you win races.