Higher-level synonyms

Occasionally the desert cliffs and slopes come right down to the river, and it is difficult, if not impossible, to carry the higher-level canals past these obstructions.

Life can be made much easier by providing higher-level abstractions on top.

I assume this higher-level work will be in the same school where you have already taught some maths.

Finally, the most serious risk is that higher-level teaching assistants are seen as a way of compensating for the shortage of qualified teachers.