Hi Mr Tariq,
First try to find their level of reading through running records- bench mark assessments. Use https://www.readinga-z.com/newfiles/levels/runrecord/runrec.html This will help you know more about it. Then based on it check if the student knows all the phonics sounds(7 groups-jolly phonics-42 sounds). Else just brush them up as they are lower secondary students. It will take just one 40 minutes session.
By following the above two procedures you can identify students who don’t know how to read using phonic sounds and then give them special care to improve their reading.
I have taught more than 500 students within 3 years. Just 10 days of practice is enough to make them good readers.