Intervals are tough! I spent a great deal of time in my first semester of college on intervals and how they fit together in key relationships. Working with major, minor, and perfect intervals will really pay off in the long run, though. I use interval training all the time in choir. Even in rehearsal this evening, sightreading pieces was easier because of proficiency in intervals. I’ll try to remember to bring my choir scores and show you what I mean.
For some extra practice in interval identification, you can try this game. Up to level 8 is stuff you’ve already learned: http://www.pedaplus.com/games/intervals/
Best wishes to those who are going to Jefferson City on Tuesday! I know you’ll represent us well.