General developer forum

I am running a class which students must attend. Most of the students do not want to take the class. These students quickly discover that they can just click their way through the class. One student had 250 page views in 90 minutes. What I would like is to build in a delay for an incorrect answer to the lesson question. First incorrect 2 minute delay, second incorrect 4 minute delay, third or more incorrect 6 minute delay. I am familiar with php but I would not know where to start in writing a module or modifying the core code. Please make suggestions as to where/how to proceed.

Thanks so much ... Michael