The Grade 12 students at my school will be making timetable changes for second semester by the end of January. Do I also need to make these changes to their academic data (through Academic Information) prior to our board’s February grades transmission to the OUAC?

No, you do not need to make these changes through COLS.

Any timetable changes for students on your school’s data system are usually sent to the OUAC in the February grades transmission. The OUAC will update the students’ files with any additions, deletions and changes that are on this transmission.

The same applies to changes sent on the April and July grades transmissions.