The direction was given by a bench headed by Justice Abhay Oka, which asked the petitioners to file rejoinders, if any, by August 22.
The matter has been posted for hearing on August 26.
The Congress-NCP government in June approved 16% reservation for Marathas and 5% for Muslims in government jobs and education institutions.
The court also allowed one of the petitioners, Ketan Tirodkar, an activist, to amend his petition within a week to include the challenge to the recent GR on the issue.
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Besides Tirodkar's PIL, the other one was filed by one Anil Thanekar, also an activist, seeking to quash the GR on the ground that the Constitution does not allow reservation on the basis of religion as has been done in the case of Muslims.
Regarding reservation for Marathas, Thanekar's PIL contended that this community does not belong to backward class.
Another petition is pending since 2009. In this case also, the HC has allowed the petitioner to carry out an amendment to challenge the GR issued recently on reservation.
Yet another PIL has been filed by 'Youth for Equality', an anti-reservation body of professionals such as doctors, engineers and chartered accountants.
All these PILs have been clubbed together and are being heard simultaneously by the bench.