When it comes to reading, AR is my favorite tool to use in the classroom.
Because every student is different, they have different weekly reading goals. Some students are responsible for reading 1 point, while others need to read 10 points a week depending on their reading ability.
Every Friday I pick up the cards of the students who met their goal and have a little raffle as a reward. Sometimes it's a tangible reward, others classroom coupons.
The point is that they feel successful at their level and slowly gain confidence/skills which will increase their reading comprehension/fluency.