1) time, or the lack of it and
2) fear of failure - you probably haven't taken exams in a while
It's our job to make your learning as easy and quick as possible. We can't do all the work for you - you'll have to put in the right amount of effort - but we can give you a learning toolkit - to make the process more manageable.
2) Delivering relevant and cost/time effective products and services in an efficient, friendly, and easy-to-use manner...