There are different and diverse ways of categorizing which secondary school actually merits to be listed as UNARGUABLY the best in Nigeria!!!
Let's base our arguement on
(1) Awards and competitions won.
(2) Laboratory capacity.
(3) Student-teacher relationship.
(4) History & pedigree of the school and finally
(5) Environment.
To me personally! I'll choose IGANMODE GRAMMAR SCHOOL,OTA,OGUN STATE. As on of the BEST if not the Best in respect to the above mentioned criterias... U can google the school if you are not convinced! Check for yourself!
NOW to you!!! Which do you think is the best

Iganmode grammer school is not even among the top 100 schools in Nigeria. I think kings college, lagos is the best secondary school if you go by awards, records and facilities

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Christ The King College, onitsha. Primus inter pares

It's eiter st Gregory college Ikoyi or Turkish international sch.

King's college, Lagos.

Federal Government College Ilorin

Eleja One High School, Iganmu

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There are so many high schools in Nigeria; FG/missionary schools used to be the standard until we bastardized everything

F.G.C. Ijanikin Lagos

Airforce Secondary School Ikeja, Lagos

British International school

infant jesus Academy and graceville international school

Federal Government Academy Suleja (Centre for the gifted and talented) a.k.a Gifted Children school.

Raiders:
Iganmode grammer school is not even among the top 100 schools in Nigeria. I think kings college, lagos is the best secondary school if you go by awards, records and facilities

. Get your facts right, mister!!! Last 2 years Iganmode grammar school was listed the 2nd best in NIGERIA. Google it! Dey've won competions both in states and in national! Ask cowbell mathematics competions, Google it!