According to oxford dictionary, examination can be defined as a formal test of a person's knowledge or proficiency in a subject or skill.
I think it's right time Nigeria teachers, lectures starts setting examination questions based on what they taught. Many Nigeria teachers lecturers will teach students with simple terminology and straight forward examples BUT during examination they will set harder question. These act reduces students performance.
If you want to test a student reasoning ability it shouldn't be during exams, you can do that by giving out assignments, workshop, projects e.t.c
Later we wonder why Nigerians that travelled out for studies returns with good results. The answer is simple they don't judge their evaluation based on only test and exams.
For every course or subject there is a table content, syllables, assignments given during teaching, home works, class discussion e.t.c so Examination questions should come from the above mentioned areas. You can't train an apprentice on Toyota then give him Benz to repair. Let teachers and lecturers set exam questions based on what they covered.
Concerning the Benue state university examination that was cancelled based on the believe that the questions are cheap. I think it's wrong to cancel the exam, there is nothing like cheap questions, some may still fail the exam, even here on nairaland we can't outrightly say it's everybody that knows the answer to the questions.
Finally it's the lecturers in charge of the course that needed to be questioned if the questions are from what they taught in class or not, if that's what he taught his/her students then it's fine.
MY PERSONAL OPINION

https://www.nairaland.com/7486492/benue-state-university-cancels-final