I've done a little research for you but can't really find much about it, so from what I've found, I will guess what might possibly be in the test
Basic music theory: chords (including chord quality (maj, min, aug, dim, half aug, half dim) chord number, chord inversion, added tones e.g. A 9th chord, 7th chord, how to label chords, things like that), staffs, chefs (g clef -treble, F clef - bass, c clef - alto tenor (there's quite a few c clefs), ledger lines, note durations (from a brieve to a semidemihemidemisemiquaver), measures and time signature (compound and simple time sigs, no time sig, etc), rest duration (see note durations), dots and ties, steps and accidentals, rhythm and meter, odd meter, scales (major, natural minor, melodic minor, harmonic minor, (possibly things such as pentatonic, Ionian, aeOlian, Phrygian, Dorian, Lydian, lochrian, mixolydian, chromatic, whole tone, broken chords, arpeggios, possibly more), scale degrees using carrots, key signatures (learn how to draw a circle of fifths it really helps), transposition to all instruments of a concert band and orchestra + possibly more, Italian, French and German terms, what symbols mean, basic instrument ranges and clefs, learning about some instruments me how they are, the basic instrument families, cadences, harmonisation, can't really think of anything else
Score reading: howtoread a score, what each instrument is (e.g. Fagotti is a bassoon), the intruments of an orchestra, the instruments of a big band, hsc music 'concepts of music', lots of what I said in basic music theory
Pitch: overall range of piece, range of individual instruments, tonality,steps or leaps between instruments, chords, keys, inversions, intervals (perfect fifth, minor 3rd, diminished 5th etc)
Duration: how short or long a note is, time sig, how a note is played
Texture: different layers of sound and how they interact with each other, e.g stabs, tutti, counterpoint, etc,
Tone colour: how the music sounds, how the individual instruments sound, how the instrument plays the music, the techniques of each instrument and how they affect each instrument, how the player plays the instrument and what effect this has on the music, etc
Dynamics and expressive techniques: dynamics, techniques of the instruments, and how they affect the tone colour
Structure: the overall structure, the micro structure, how the rest of the concepts affect the structure, etc
Sorry I would go into more detail but I haven't had to think about this for 2 months
Music style:
Renaissance, baroque, classical, romantic, impressionist, modern, etc
With each of the above periods, you need to know a few composers and a bit about them, the size of the orchestra and how it developed, the style and how each of the music sounds, know a few large and famous works
E.g. Baroque
Dates 1600-1750
Composers js Bach, Vivaldi, Monteverdi, Handel
Style: repeating passages which allow for terraced dynamics, doesn't allow for much expression, a eru straight and simple division of the beats, accompaniment would usually be a figured bass, accompaniment would be usually played by a harpsichord and viola de gamba,
Small orchestra, increasing availability of instruments allowed for the demand of chamber music, etc
Major works: water music, fireworks suite, dido and Aenea
That's a small example but you probably need to know it in a lot more detail
Hope that helps, that's a very basic overview of what could be in the test. If u need any help, don't hesitate to contact me and I will try my best to help