GUYS WHAT THE ABSOLUTE FUCK
I found "mid year exam" directly on part 17 of 18 on fbi.vault.gov, page 12 of 143:
https:// vault.fbi.gov/hillary-r.-clinton/Hillary%20R.%20Clinton%20Part%2017%20of%2018/view
Look for mid-year, mid year, mid year exam, mid-year exam, exam, or MYE in the Page/Strzok texts. We all knew it meant the Hillary email investigation, but I never saw anyone tie it to an actual FBI document.
Found a better one, the MIDYEAR EXAM briefing acknowledgement by Strzok himself, page 53 of 143, Clinton investigation document 17 of 18.