Historical clue formulations

• *4.0 on a transcript — 2021-12-27
• 90s, say — 2021-01-28
• Stellar student's boast — 2015-02-25
• It's between 90 and 100 — 2011-03-19
• It's above 90 — 2010-07-10
• Top student's pride — 2000-06-08