Icd9 trouble

I'm embarrassed to say that although I passed my CPC in May, I did not do well on the ICD9 section. I do not know why. I don't know if I had the right codes just sequenced wrong or if I was completely wrong. In addition, this week I received a call for a remote position I applied for. They sent me a test. If I had passed with a 90% I would have had the job. Unfortunately, I did not score high enough. Again, it did not seem hard. It was all diagnosis codes. I reviewed the guidelines as I answered and read and watched for notations in the tabular as well. I do not know what I am doing wrong. Im afraid to apply anywhere else remote or on site for fear I make a fool out of myself. I am worried and don't know quite what to do to figure out what I'm doing wrong. Any suggestions that could help me would be much appreciated. Thank you.

Icd9 trouble