Any chart that is legal in the area/country you are flying in would be the logical answer
I would check this with a school, first. One thing I found on my CPL course was that the school insist on following a very strict syllabus, every detail of which has to be approved by the CAA - right down to insisting on you using the "approved" method of navigation. I don't know whether this includes an "approved" type of chart or not.
FFF
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