"They were happy, if my school was okay with it," Kerr said.
"I wouldn't have done it if my school weren't comfortable about it, but Tawa College has been really supportive and we're confident I'll pass the year."
Legspinner Kerr, who has taken an impressive 28 wickets in her first 17 ODIs for New Zealand and has eight in eight T20 internationals, said the presence of Bates in the Vipers squad was a key factor in her decision, a familiar face who has been a big help in Kerr's early international career.
"I'm really excited, a little bit nervous coming into a new team and competition, but I know I'll enjoy it," she said.
"It's an awesome opportunity, especially with a World T20 (in the West Indies in November) at the end of the year - playing lots of competitive cricket leading into that will be ideal."