Should my math teacher talk about my grades in his letter of recommendation? I did really well at school except for the final exams where I got terrible grades. Thoughout the years, my grades were above average but I got terrible grades in my finals(which count for 50% in my country) and that caused me to get a GPA of 2.4.
Should my math teacher talk about how/why i got bad grades in my finals? It's quite clear that I almost failed because of those grades but it's also quite clear that I was an A student before those grades.
If he doesn't talk about my math abilities(or disabilities) then what should he talk about?
Please help me, I need to send this letter next week
Your advisor might be limited by local law about what s/he may say about your grades. But they can probably say that your grades don't completely reflect your abilities and then comment on those abilities. But, IMO, a too-detailed letter won't serve you as well as one that is more general and speaks about your abilities. If they focus on the positive then it should serve you better, I think. 

However, if you have difficulty in exams you should find a way to work on that. Perhaps it is just ineffective studying. Cramming is a poor way to learn, if that is it. Taking and reviewing better notes throughout the course is a much better way to learn.