My groundschool for PPL training (in 1992) consisted of a ten minute briefing before each flight followed ,if i really got lucky by five minutes after the flight.
I did get half an hour on the whizzwheel when I was struggling with Nav, but the rest was self briefing from Trevor Thom. I gather T T has been revised now as IIRC there were many mistakes in it.
But for PPL I'm sure its adequate.
If you've got a reasonable instructor your should be able to get him to answer anything that is not clear from the books.