yes, instrument class fee included in school tuition fee already, no extra cost.
only need to buy the instrument and music score
one more thing on the choice of instrument is that preferences must be filled in the selection form but no guarantee on allocation of first choice and can't switch/ change instrument once admitted.
There is no pressure. My daughter in grade 6 and she is very happy with her oboe classes. The school hire all those instrument teachers if they are not available in school. You can choose from Chinese or western musical instruments.
There will be a parents' night telling you how to choose the musical instrument for your kids close to end if 2nd term.