Pupils do not learn all the multiplication at once, and they also not have to learn them one after each other in the right order.
For example thet can learn first 1, 5 and 9 because there are some tricks to learn them quickly. Then they would learn 2 and 4.
We should be able to present them with a menu telling them on which tables they will be asked for.
A solution could be to present them a menu like in lang with a check which selects what they will be asked for.