Is it possible to launch an placement on all the courses at once?

We strongly advise you not to launch the placement on all courses. Proceed by series and prioritize the courses that are the longest and/or consume the most resources (high school specializations, complex courses, co-teaching courses, etc.).: the software will take less time to perform its calculations if you proceed in this order.

Placing by small series of courses also allows you to effectively resolve failed courses as they appear.