Collocations for mastery - noun

absolute, complete, total | gradual
Children show gradual mastery of reading in the first years at school.

practical, technical
He plays the violin with technical mastery, but no feeling.

have
The allied bombers had total mastery of the skies.

demonstrate, display, show
He shows complete mastery of the instrument.

achieve, acquire, attain, gain

~ of
He acquired mastery of four languages.

~ over
The king had absolute mastery over the country.