Am I being a nightmare parent regarding DS maths report?

[mathshelpplease]

Would appreciate honest answers if anyone thinks I'm being one of 'those parents' that teachers talk about. I appreciate I probably am.
My DS is 12, almost 13 and about to finish senior 1 at school in Scotland. Maths has always been one of his better subjects and he hasn't had any issues with it. When we went to parents evening in Feb his maths teacher said he was doing great with no issues. He has had 3 class tests in maths this year with marks of 87%, 90% then the last test was 50%. My DS said he did so badly in the last test as the class was advised to revise only the areas they found difficult. So he concentrated on all the tricky, complex maths and missed out the stuff he thought would be easy. However on test day it was the easy stuff only that came up and he didn't do well as he had forgotten some of it.
He got his end of year report last week and he got a C for maths. He got As and Bs for his other subjects. His report was completed by the maths teacher he gets for revision only 1 day per week. He gets another teacher for 3 days per week for maths.
Am I being a PITA if I speak to his maths teacher about this? I don't for one minute want them to change his mark of course. He obviously did not do well on his last test. However I feel we've never been alerted to an issue in maths before and are totally surprised with the report at the end of the year.
I've never contacted school about any issue before so just looking for guidance on if I should just leave it.
Thanks

They have 2 weeks left so you could ask what he needs to brush up on in holidays? My son isn’t into maths at all he got terrible grades for his maths papers so we have a plan to improve and he’s getting extra support from school. I called and asked as his brother had dyscalculia so just wanted to rule it out. Hopefully it was just a blip but best to get it sorted in s1/2 before nationals etc

I think the good thing is that you both know where he went wrong and how to fix the problem - I don't find teachers probably think too long and hard about grades at this age. Maybe the last test was the test on 'everything' and so was the one the grade was based on. It doesn't sound like he has any issues and the grade doesn't mean anything (I assume) so I'd just move on and forget about it unless it's going to impact what set he goes into or something like that. DS got 19 out of 55 for his first A-level test, but he got an A star in his end of year exam - sometimes it's good to get a kick up the bum!

Just to follow up-thanks all. I emailed the teacher last night and she helpfully replied this morning. She said the final test was a 'full year' test so covered everything they had done that year. I kind of wished I had known that and I would have made bloody sure DS studied much better for it!!
She said pupils that do not have a regular study routine sometimes find it more difficult to study for a test. So I think I'll need to start DS studying for each class every evening. Any tips on how I practically do this? Maybe choose 3 subjects/week and slot this into his usual homework routine?
Finally she directed me towards a really good maths website and gave practical advice on how he should revise using this resource (it's called Corbettmaths. Looks excellent)
I'm really glad I emailed. Wished I had known about the issue sooner though and spoke to her before now.

Your ds misunderstood the instruction to revise. What he finds easy may be trickier for another. You could ask if the grade purely reflects the test score or of there are other issues with his classwork or engagement.

Talk to teacher about it

If His grade on that paper do not affect his life in any way so I'd just make it a quick chat rather than heavy sit down meeting

Just make it between you and teacher , not DS and not management

The advice to revise the bits you don't know / find hard. Is obvious advise and nothing wrong there

He'll learn from it OP. Always revise everything.

This is why it is helpful to have these sort of exams and tests along the way.

your ds is learning about how to revise, how he studies and how that works for him.

As long as you know that he is fundamentally OK. Then it is all about learning balance. How ot go over what you know, and learn the things you are not sure about.

You will be doing amazingly well if you can persuade a 13 year old to do a lot of extra study on top of homework. But if you do, then half the battle is getting them to make some sort of record/chart/list of the topics in each subject.

My dd is now 15, and big exams next year. Last weekend we finally found a system which is working for her. (to be frank, she hasn't been open to trying to find a system until now) She is using the revision books that you can buy online and going through each subject. Too late really for this year's exams (this week and next) but it has really helped her to find a structure that she can use. Being faced with her whole maths folder for example was too much.

He did poorly. If you do speak to the teacher it should be to ask which areas he found difficult. Maybe he could go over these things in his own time? The report reflects the teacher's view. He obviously is not as good as he thought