O level retake Private Schools

Hi guys does anyone know any tuition centre/ private schools that are offering O level retaking classes from Mondays to Fridays. Mainly looking for people that can vouch for the tuition centre/ private school as I'm trying to do well this time round.

Do also share your success stories after going to these tuition centres/private schools as I'm trying to go from 21 raw R5 to 13 raw R5. Mainly retaking Amath, Emath, Pure physics and chemistry possibly english.