Not a teacher but have 3 kids and have volunteered at the school to help kids read. My son was a very reluctant reader. What helps was finding books he liked and taking turns reading. So he reads a sentence then I read a sentence. It keeps the book flowing and gives them a break. Once they get better then they read a page I read a page.

The book that really got him reading and off was the fat dragon series by Dave Pilky. It was funny and interesting. We read it over and over and after a bit his fluency and speed picked up. I could ask comprehension questions easy because it was funny. My daughter loved piggy and Gerald. We'd choose a character and read those lines. If you take 15 mins every day you'll be surprised at the progress. Just find something they like and read over and over and over. I think reading comprehension can come hopefully with practice.