Say Mach Number is absolutely right. The company will never get rid of you to replace you with another cadet. They need you and want you to pass everything. The training department, from initial type rating right through to line training and beyond is usually very well organised and professional and the quality of training you will receive will be excellent.
You must be prepared to put in a lot of hard work though as it is tough and there is a lot to learn. Occasionally one or two people struggle and some take longer than others to pass but I would guess 99% come through the system with few or no problems.