Problem with form results

I have 1 table which holds the info for tests, one that holds the questions details, one that holds the options, one that holds the general result and one that holds the full results.
This system is more flexible, because this way you may have an question which have no correct option (and still be marked), each question may have pictures, and may have as many options as necesary (each of them with or without pictures). Also, I may make statistics regarding all the answers/options.
And by sending only the question and option number I avoid complicate calculus for geting the right result.
The only problem is that I need to make sure when deleting a test to delete also all the questions and all the options of the questions. It took me a while until I mastered that.