Fingerzcrossed
Im pretty sure you wont fail, I was so so worried about that all through my training because I dont retain information well but I got no less then 95% in all my exms and trust me I have never ever gotton marks like that.
The instructors are great and will explaing things over and over again until you get it, will make time outside of class to go over things your not understanding which if thats the case with you as it was with me make sure you put your hand up for help. If you do fail an exam you get to do it again and the questions are the same you even get to see where you went wrong you"ll come to class 1 hr earlier the next day and re do it but your pass mark needs to be higher but that happned to no one in my class. Study with friends after class just a little each day and you'll be fine besides it all comes together once you get out online. Hope this helpt a little goodluck :-)