The PT slots stand for Peak Time slots and The PPT stands for ones that are Peak Peak Time and translate as the most booked slots for their students. PT M-Sun 6:00 pm to 7:00 pm BJT (2 slots) PT Sat-Sun 11:00 am to 6:00 pm BJT PPT M-Sun 7:00 pm to 9:00 pm BJT PPT Sat-Sun 8:30 am to 11:00 am BJT