He sounds very similar to my youngest son, Emmy. (He's 14 so year 10 - first year of GCSEs.) I have two older boys (17 year old twins) and I think I've been incredibly lucky with them in that they have been very motivated, high achieving and required minimal/zero input with studying.
My youngest sounds just like your son.
It looks like parents night has come at the right time for you. It was my son's last week. I heard a lot of positive feedback on him (his confidence has improved, he has good presentation skills, offers opinions in class, is friendly, respectful etc although his concentration can tend to wander from time to time - none of which would have been said a few years ago so this is all good stuff). 'Points for improvement' include more attention to detail in his classwork and homework and better preparation for tests/exams. His predicted grades are not high but I have always stressed that I am more concerned with effort.
Anyway, I've taken the feedback from parents night as a call to action and this weekend have helped him to get a bit more organised. First of all, I concentrated on all the positive feedback I got from parents night and explained how the negative points could be turned round eg going into more detail in answers; giving me more notice of forthcoming tests so we can prepare together; making sure his concentration does not waiver in class.
For example, he has a science test today so I've helped him over the weekend to revise - got him to make a page of notes on each topic, tested him etc. Tomorrow he has a history test so tonight I will give him a bit of help on that. On a weekly basis he knows he has to tell me when tests/assessments are coming up so I can help him prepare better for them.
It's good that you will get the full picture next week, let us know how he gets on and if there's anything we can suggest after that.