The main problem is that the answers to the test questions are so inflexible that some questions becomes very confusing. An example could be:

"Both IDS and IPS solutions analyze network packets and compare them to known attack signatures or typical traffic patterns. This process involves" - the question here may be "What analyze a network packet and compare them to known attack signatures?" Your answer may be IDS and IPS, but the answer may be IDS & IPS or IDS, IPS or IPS and IDS but non of those will be accepted although all correct.

The problem then becomes that you move away from the correct answer because you think its wrong and by the time you get the right answer its guess work because you got sniped by a missing comma hence no learning is really sticking.

So many questions in their tests requires very specific answers that obviously can be answered in variation. Often you will find yourself wasting time finding the 1-1 correct wording because it lacks flexibility.