If you have a backlog in any subject in any semester, you have to clear it first. No Indian University can grant you a degree without clearing all your backlogs, even the private ones such as PES University.

• There is a system called Fast Track in which you can clear 2 backlogs of 4 credits each within two weeks after your final semester at PES University. 
• If you still have more subjects or you could not clear them during the two-week window, you have to clear them within the summer term period. 
• If you can clear all your backlogs before the summer term, you will get your degree with other students as usual.

Finally, these are still plug-in mechanisms. Try to avoid backlogs altogether if possible.