As has already been stated above.
Before going solo, I too was asked if I had passed air law. Also I got briefed on the two questions I got wrong in the exam.
Following that, I did a check ride with another instructor, once through that 'hoop' I went solo.
Finally I agree with the previous posting that the book on Air Law by Trevor Thom and the PPL Confuser are excellent revision aids.
Good luck with that solo!