We can do that with a couple of php scripts. to try this out I created a form with two fields, a text field 'question' (what is 2 x 2?)and a dropdown 'answer' (3,6.4.8,32)
If they get the answer correct we can use the default Rsform thank you page with a custom message like CORRECT! in a big font, for the sorry create a joomla article witf for example WRONG! in a big font, create a hidden menu link to this article and copy the url somewhere.
In sripts called on form process put this...
Now in...