Here are two online resources I can strongly
recommend to better prepare people looking to get a job (especially in Nigeria):
JarusHub is an online career portal that helps with interview coaching, CV writing, assessment centre coaching, and basically
everything you need to get a job. I respect Jarushub particularly for its rich inventory of interviews with successful executives, who offer very practical advice on career success.
Testcentre is specifically designed to help with assessment tests. It boasts of several sample SHL, Dragnet, Workforce and personality
tests. I do not know a better source to help you prepare specifically for job assessment tests in Nigeria.
I sincerely believe that these sites would improve your odds of getting a good job.
Please drop other good resources in the comment section, and share this post with those who may need to see it.