Maybe. I wouldn't use the term 'grad school' for an MSc program, unless its the first two years of a US PhD. I think the OP is talking about PhD programs too.

Maybe. I wouldn't use the term 'grad school' for an MSc program, unless its the first two years of a US PhD. I think the OP is talking about PhD programs too. After all, doing a short MSc doesn't prevent you doing YC afterwards.