Four Star is very good and I find it really does the job in both sight-reading and aural training. My suggestion is that when the book asks you to sing the third, fifth, forth, sixth note above or below the note on the page that you do this, actually sing. Over time, it trains your ability to identify intervals really well. Unfortunately it was written with children's singing range so it took a long time to be able to sing so high. You could play one octave lower to adjust. Very good resource. I already bought every level to 10! The sight-reading exercises in level 9 and 10 are crazy. It's like straight out of level 7 repertoire. So far, for level 5 for me, very easy if you start at level 1 and work your way up along with your repertoire level.
You do the exercises at home, then you bring the book to your teacher to complete the test from the back of the book each week. It works. Highly recommend.
Practice is never finished, only abandoned.
Studying RCM Level 5 | Yamaha C3X