Potential presidential candidate Jeb Bush advised parents against opting out of Common Core tests Thursday, saying not taking the tests would make it harder for students to graduate high school and go to college.

“If [opting out is] going to make it harder for you to graduate, it’s going to make you harder to get into college, I think you need to rethink [opting out],” Bush said when asked what he would say to a parent who was considering opting their child out of Common Core tests. “The idea that you’re opting out of a test because it’s stressful — what’s the world like?”