Try some of these in your at-home practice sessions!
http://www.jwpepper.com/sheet-music/welcome.jsp - Type in the title of the piece and the last name of the composer and click on the 'play' button. Almost all pieces on JW Pepper has a recording to listen to, analyze, and use as a tool to practice. However, there are still several pieces where searching on Youtube.com might be the only option.
http://a.bestmetronome.com/ - Simply select a tempo that will allow you to practice all parts of the music successfully. Start slow and build up from there. Work one measure at a time and keep going! Stay in time!
http://www.musictheory.net/exercises - Choose either note or key signature identification. Once selected, click in the top right-hand corner of the page to 'customize' the correct clef(bass or treble), the correct range of notes per instrument(what we work on in lessons), and select the amount of key signatures(based on the scales covered in lessons and rehearsals).