BOOK English meaning

The Fun they Had Summary for Class 9 NCERT English Chapter 1 Beehive Book Explanation, Word meaning and Question Answers What does 'regular' mean here?

I applied for LLR online But I am exempted to book slot because I already got LLR in past and it expired The application currently shows

ll slot book means Also, if your RTO doesn't allow to book slot at midnight , it will show the time, when will slot booking start Means, if you are booking slot

ll_dl services slot book It could also mean Allow Cellular Data Switching is not turned on When you're on a call, an incoming call on your other phone number will go to