All course quizzes have a pass mark to ensure that you have demonstrated proficient knowledge and understanding of all core concepts. You are welcome to retake each quiz as many time as you need to pass the course.
It depends. Some courses are self-contained, others have different modules that you can select depending upon whether your job involves injection moulding or thermoforming, for example. The individual course overview page should make it clear whether these options exist.
If you have technical problems please email firstname.lastname@example.org or call 0207 457 5000. Please note that the person answering will not be able to advise you on technical issues but they will be able to put you in touch with the most appropriate, available person.