Fun isn’t it?
Has your instructor talked about using an aiming point on the windscreen as a reference for when you’re low or high? I bet he will.
Or does that runway have a PAPI or VASI or similar?
Aim point is a pretty common technique when a visual glideslope indicator isn’t available. You can search it and find lots of other examples, but here’s a randomly picked one from YouTube.
You can go back with that in mind and look at your video and see what the numbers were doing on the approaches where you thought you were okay and the instructor was saying you were going low. (I don’t think you had one where you went high, but eventually you will!
)
Some instructors don’t use this technique, but has he ever said:
Pitch for airspeed, power for altitude.
We could discuss that a little more if you’d like but some instructors don’t use it. Eventually you realize there’s an interaction between the two, but it’s a good way to simplify what feels to you like juggling too many balls.
That last landing worked out nicely, eh? Good job!