International school for kids? (Lagos)

Hi everyone! I'm here in V.I - Lagos for just a few months, and very glad to know and join you in this community.
I will be here for 4 years more in my assignment. And now I'm preparing to bring my kids here next school-year. My two boys are 12 and 9 yrs old, meaning they will get into 6 and 3 grade next year.
My big concern now is to find an international school both in elementary and secondary grades, not a local Nigerian school. I have worked with American International School but their admission fees is far high and they said the applicants now are over their capacity.
I would like to hear from you for your advices of good international schools here, in V.I or Lekki phase 1.
Many thanks!

DUC