After increasing the intelligence stat, Dustin found a place later to lay his head and sleep, as to see if the effects would happen after he slept. He had strong hopes that this would be the case, so he placed the results on that.
After he woke up, Dustin immediately came to his senses on why he even slept to begin with, so he just sat down there on the spot waiting for something that would indicate that he had become more intelligent happened, but just like expected, there was no such thing. He wasn't just going to know whether or not he had become smarter, so he needed to do a test.
The fact that Dustin didn't finish school was also a problem, since he wouldn't know some mathematical questions to structure and ask himself, so the process was dull. Instead of that, he tried to do something within his grasp, so he tried understanding how the ignition of fire using fire magic works.