Here are some ideas by conductor and music educator Eugene Corporon I recently came across about the differences between rehearsing and practicing. Food for thought for all the music students out there.
Rehearsals are not the place to teach the parts, but rather the place to put the pieces together.
The rehearsal is a place to do the things together that you can’t do alone. (You can learn your part alone.)
You don’t come to rehearsal to learn your part, but rather to learn everybody else’s part.