I love what StopDadithurts said.... if you want more resources about this topic I'd start with The CAFE Book and if you're an elementary teacher I highly recommend The Next Step in Guided Reading.
I use post-it notes and "pre-sticky" the books my reading groups are going to read with comprehension questions. You can also color code the post-its to have kids work on other comprehension skills (ex- blue sticky = make a predication, pink sticky = check for understanding, etc.). I highly recommend teaching the student how to "stop, think, paraphrase" and then showing them how to "go back and reread" when they can't accurately paraphrase. Self-monitoring is key and I model the heck out of this skill and guide them through the process.
One other suggestion, chose a book that is high interest to the student, on the easy side of their instructional reading level, and has a simple plot so they can master basic comprehension skills. Once they get the hang of that, start adding in more complex plots and other genres. Basically, teach them how to self-monitor with an easier book, then work your way up. It builds their confidence too and gives you an easy way to give specific praise (Oooo... I really like how you asked a question about this character. Good readers are always asking questions about the text they're reading). You know the drill....
I recommend taking notes and dating them to have additional documentation of your student's progress along with all the usual tests. I notice a lot of patterns in my students' reading that way and it helps me be more effective (and it's good for SST meetings if necessary).
If you're middle/high school this is probably not as helpful although a reader not comprehending is a reader not comprehending. Let me know if you have any questions and best of luck!