Kautilya's Arthashastra 1.5.8

1.5.8

vṛttopanayanas trayīm ānvīkṣikīṃ ca śiṣṭebhyo vārttām adhyakṣebhyo daṇḍanītiṃ vaktṛprayoktṛbhyaḥ //

Having undergone the ceremony of tonsure, the student shall learn the alphabet (lipi) and arithmetic. After investiture with sacred thread, he shall study the triple Vedas, the science of Anvikshaki under teachers of acknowledged authority (sishta), the science of Vatra under government superintendents, and the science of Dandaniti under theoretical and practical politicians (vaktriprayoktribhyah).