The use of 8 keys without a mouse was introduced by JAMB to make this year 2017 CBT friendly for candidates.
The 8 keys are;
1. A - for choosing option A in response to questions
2. B - for choosing the B option
3. C - represents option C
4. D - for selecting option D
5. P – represents previous question
6. N – is for next questions.
7. S – is for submit
8. R – is for reverse.
This is a useful info from another platform.

Nice one OP.. But thunder that will fire Jamb is still doin push up