If you deploy a lot of quotations in your essay, it appears as though several people are talking about the topic apart from yourself. This would downplay your own voice and leaves little room for your own ideas. It is your essay and it should be your voice that needs to be heard, not some notable/famous person’s. Quote as infrequently as possible. So, don’t cram every quote you know into the essay. As a rule of thumb, refrain from using more than 2 quotes in any essay. (One in the introductory paragraph and the other if necessary in the conclusion)
The final paragraph is the place to cover what else you would need to know before you are able to decide whether the conclusion is actually valid. This �what else� paragraph obviates the necessity for a formal conclusion. Useful statements are along the lines of:
In order to decide whether, indeed, ABC is actually the case, it would be useful to have access to XYZ.
XYZ might include one or other of: Expert opinion (. business consultant) / statistics / surveys / research data etc depending on the focus of the essay.
It is useful to end the essay on a note of doubt. Suggest that the argument might have a valid point, but that more information would be needed to come to a specific conclusion.
Critics have also stated that the computer-adaptive method of placing more weight on the first several questions is biased against test takers who typically perform poorly at the beginning of a test due to stress or confusion before becoming more comfortable as the exam continues.  On the other hand, standard fixed-form tests could equally be said to be "biased" against students with less testing stamina since they would need to be approximately twice the length of an equivalent computer adaptive test to obtain a similar level of precision.