I feel like they worded it poorly or misinterpret it from the source. Post-soviet edu has all three at 5th grade (age 10-12), the beginning of the middle school, because only then you can start and learn respective fields for remaining 5-7 years. If you place them in the last year of school it you don’t have a room for that at all.
I suppose it should’ve meant ‘in their whole 10-year program’, not the tenth grade.
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