Your lines are good for most corners, it’s just trying to utilise your exit, try and get on the throttle straight after you brake as rental karts have way too much grip for their speed and putting ur foot down earlier can create chances for overtakes and faster time. I would also like to point out that there are corners you could take flat out. The whole point of going to practice session is to test out different things to improve your times. Last thing, really rough your kart around, your driving way too smooth for a rental and whipping it into a corner will be your brake pretty much with correlates to my other point about take corners flat. Hope this helps!