Lanseria cooks!! Those runways are so close together and the ATCs use them as parallels. Cock-ups happen when the student, or whoever approaching from the south for right base 06R, hammerheads and conflicts with the tfc on approach for 06L.
Its very busy airspace!! I have seen 5-6 aicraft doing circuits on the right and then there were two citations doing circuits on the left. Plus all the usual in- and outbound tfc.
Avoid doing training on saturday and sunday mornings. Its just too busy and you might get stuck out at the dam waiting for joining clearance.
Generally ATC does good work there and they are always friendly and helpful.