Know the neck cold.

Turn each peg by ear until the string locks in against a reference tone. One rep is a full 6-string tune-up, graded in cents off target.

You're told a chord by name - no diagram, no reference - and you play it. One rep is one strum, graded on whether every note of the chord actually rang out.

An open-position chord gets strummed for real - name it. One rep is one chord identified and checked, across the eight classic open major and minor shapes.

A position lights up on the neck - name the note. One rep is one position named and checked, starting at open strings and the first 3 frets, working up to the whole practical neck.

You're given a scale and a fretboard position - is that note in the scale, or not? One rep is one call made and checked, starting at the major scale in one key, working up through modes.

A click plays at tempo - pick the target string on every beat. One rep is one timed run, graded on how many beats landed on the right string, right on time.

A backing drone sets the key, then you're told a note - land it anywhere on the neck before time runs out. One rep is one target, starting at minor pentatonic, working up through all seven modes.

A major scale is laid out as tab - study it, then play it for real. One rep is one scale played and checked note by note, starting at E major open position, working up to any key, ascending and back down.

A minor pentatonic shape is laid out as tab - study it, then play it at your own pace. Each note is listened for in order, and it moves on the moment you play it right.