It may come as a surprise, but some teachers don’t hammer home the importance of repetition. A child can be taught an aspect of the syllabus, and then not encounter it again until exam time – and you expect them to be comfortable with it?
From an early age, children are taught to remember spellings and times tables, by constantly repeating the information, until they are confident that it has sunk in. Yet from the age of 11+, many elements of the curriculum are no longer repeated. It is assumed that everything that has come before will be retained with clarity, and thus there is a problem. Not every individual has a great long-term memory. Furthermore, if a gap emerges on a more basic topic, the fear of ridicule shames children into silence. No 16-year-old wants to ask about the basics of mathematics in front of their peer group. It is a vicious circle.
The solution? Repetition, repetition, repetition. Everybody needs a reminder at some point, otherwise the fundamental skills disappear. Don’t let yourself be held back!