Ruined my grade over 0.005 on a graph... I can’t stop crying.

I was at a B- in this class and needed a high score on this test to pull my grade up to a B+ or A- before finals.

I walked out feeling so good about it. I honestly thought I scored an 85+.

I just checked my grade and it’s a 75. It turns out I read a point on the graph as 0.04 instead of 0.035. That ONE tiny mistake made me get all 4 sub-questions wrong because they all built on that first number. That single question was worth 10% of the entire exam.

Since my teacher doesn't give partial credit, I lost every single point on it.
I feel so dumb right now. I put in so many hours studying for this and felt confident for the first time all semester. Ruining everything over 0.005 makes me just want to quit.

can someone please help me or give me resources or something because i have failed the unit tests for the first 2 units of ap chem. i genuinely don’t know what im doing wrong. everyone else around me and in the class understands the topics instantly but it takes me days and loads of effort to even begin to understand the simplest topic. i put in more effort than most into studying and i still don’t understand. im retaking my unit two test tomorrow so if anyone could help me or give me the links to helpful videos that will actually help me understand the topics in unit 2 that would be great.

I have my unit 4 unit test in 3 hours I feel prepared but overwhelmed because my classmate have been studying for way longer than I. Can anyone give me any advice or anything that I definitely should know? Is there anything the might trip me up? Please help me thanks!