If you discover that your children are not doing well, you can arrange extra lesson for them especially on saturday or twice in a week, it depends on your schedule, however, if they are doing well in school, you may not need to bother about extra lesson.
One thing we must know is that no knowledge is lost, there is no harm in adding knowledge to knowledge, it could be stressful but it is still the best option, you know we are talking about the educational foundation of our children which is very crucial. Some of these private schools are fake, you may not know until you begin to ask your child certain questions.
The truth is that extra lesson will always give them an edge.
God bless. God2man.