Which column is supposed to be the grade?

It is not the table column that has the data, it is the record's element and the value fields that are relevant.
The element cmi.core.score.raw's value is the score/grade and the element cmi.core.lesson_status' value is the status (passed/completed/failed etc etc) see https://scorm.com/scorm-explained/technical-scorm/run-time/run-time-reference/#section-2 for SCORM 1.2 elements details.
However, your table does not appear to be standard - my 3.5 table does not have the fields after the timemodified field.