There's no single definitive ranking of the best secondary schools in Nigeria that consistently places Air Force Secondary School, Ikeja at a specific rank. Rankings vary depending on the criteria used (exam results, facilities, extra-curricular activities, etc.) and the organization doing the ranking. Many reputable ranking organizations don't even cover all schools in Nigeria.
To find information about its ranking, you would need to search for specific school ranking websites or publications focusing on Nigerian secondary schools. Even then, treat any ranking with a degree of caution as methodologies differ.