Can anybody suggest me with the list of the top schools in Lucknow?

Loreto Convent (for girls), City Montessori and Jaipuria (used to be really good, you might want to check up on the current situation), St. Francis College (for boys). You can also check out Mahanagar Girls and Mahanagar Boys. Again, used to be really good, but I don't know how good they are now.

I know Loreto and St. Francis were and still are really good because my cousins studied there and both these schools have board exams toppers every year. Also, great extra-curricular activities.