Zenith Bank (to the best of my knowledge):
The format is: Numerical Reasoning, Comprehension, Sentence Correction and
Critical Reasoning. There are 100 questions and you have 2 hours. It'll be nice if you can get
Barrons foreign GMAT. They use questions from foreign GMAT, for all the sections.
But considering the urgency and limited time you've got, i suggest u read d basics of any gmat u can get.
The questions are very voluminous and you have to read fast.
Good luck