The case is being heard in camera as the accused are only 16 years old.
“The study conducted by social workers and the like was discussed in court yesterday, and they are continuing with that process today,” said police spokesperson Warrant Officer Kay Makhubela.
The girls were found dead in a field in Dobsonville in February, still wearing their George Khoza Secondary School uniforms.
Three black candles and two new razor blades were found near the bodies of the girls which prompted the South African Police Service to call in its Occult Investigation Unit.
In February, the head detective of harmful and religious practices in Gauteng, Lieutenant-Colonel Hendriek de Jager, claimed there had been an increase in occult related crimes in the province.
Since December, of the 78 occult-related inquiries reported, 48 were criminal cases.
Damon Leff, of the South African Pagan Rights Alliance, said allegations of Satanism were made far too often.
“Almost all of them later prove to be false, inflated, incorrectly assumed, and not supported by any other evidence than speculation,” said Leff.
“Even well-known cases that have landed in court prove the satanic allegation to be either urban legend or self-perpetuating myth, and not the primary motivation for what amounts essentially to violent criminal intent.”