When tens of thousands of students sit their first Higher School Certificate exam on Monday, they'll have a high-profile supporter on their side: the NSW Premier.

In a Facebook post on Sunday night, Mike Baird shared some of his own academic history to help reassure students who will sit down for the first English paper at 10.20am.

"Back when I was in school, a typical report card said something like 'Mike talks too much in class'," the post said.