Gst on professional services

reverse charge is applicable in case registered person takes any kind of service or buy any goods from the unregistered person.

specifically in your case you need to pay GST on reverse charge basis whether or not you collect the same from the professionals.

please share the details of such deduction with the professional before deducting the same so as to avoid any kind if disputes in future

Education related activities is Nil/Excempt under GST.

Then employer employee activities is also not cover under GST

Their is no employer employees relation as faculties giving their lecture as services to institute so RCM is applicable and tax liability is discharged by institute