haha nice question,
this is really difficult one...
there are two aspects
1) you want him/her to study at his own withouf your assistance, if yes this is wrong
2) you want him/her not to remind again n again, if this it is fine.
solution : get them involve in studies with fun loving assignments.
put some competitions b/w them.
try to mould the subject with the interest they have, e.g if they love cricket then you can use maths avg and other calculations formula easily.
same goes with movies and language, can use dialogues and tenses.