The "trick" is actually a tax loophole But it also assumes the student is not his parent's dependent. Otherwise, he cannot claim the tuition credit (the parent gets to claim it on her return).
But (again), the parent is allowed to forego claiming the student, on her return, to allow the student to claim the non-refundable portion of the tax credit. Since the student has a tax liability, in this case, that may be advisable.
But (again), a student under 24 with no earned income is not allowed to claim the (up to $1000) refundable portion of the American Opportunity Credit.
As you can see, it's a very complicated situation, and the student (and parent) may seek competent tax preparation assistance and not try tackling it alone. The parent may have to file an amended tax return to allow the student to claim the credit. Even better, she may need to file an amended return to claim the tuition credit for herself (it's as much as $2500 while only increasing the student's taxable income by $4000. 4000 x 15% = only $600 tax for the student). The parent can use the loophole, as long as the student reports an equivalent amount of income on his return. For bridan, that means reporting $15,995 (11995 + 4000) income At, 10K - 20K income, the mother is probably getting EIC, for claiming the dependent.
If the parent will not divulge income, for purposes of the kiddie tax calculation, the taxpayer is allowed to use an estimate.