I can explain. If approved before 18th March, one can enter Canada with the approval letter. If after, one can only enter with the study permit. But note that the study permit will only be given to one if the one reaches the port of entry in Canada. This means only the students who have applied from within Canada and got their fully-approved SPs mailed to them can enter Canada with approval after 18th March.It is not clear for me. All students and the students for high schools as well need an approved study permit from Germany. What do you mean with "point of entry letter ..."? My daughter can´t enter Canada without an approved study permit due to travel restrictions.
We were discussing about VISAs that could allow one to get to Canada, some countries don't require it but some countries do.