C.R.
You will probably be having parent/teacher conferences soon. You could discuss with his teacher what her expectation is so you understand her grading system better. My first grade daughter comes home with spelling tests that are marked all over for capitalization errors and for letters not quite formed right. She writes on the test "100" though. I am glad that her teacher takes the time to teach her the correct format....it doesn't count this year but next year it will and I want her to be prepared. I think it's important to look at the teacher overall and the success that your son is having (or not) in her classroom. If he's having a great year then I wouldn't get too worked up about it. If you feel like the teacher makes him feel like he can't do anything right, then I would call the teacher immediately.