Teachers

So today marks the end of a six week grading period at my school. So teachers show us our grades and im feeling ok mostly A and B and one C (ap gopo/econ Ugh). Feeling good about how i did and knowing there could be room for improvement i go to my last class which is human anatomy we do some random work and she like ok grade time, everything looks good my friends all having grades in the a and b range. When she comes down to my grade theirs a BIG FAT 0%! I ask the teacher why i had that grade and she tell me to stay after school. I stay and ask her and all she has to say is i misplaced your packet or u never turned it in. I told her have u looked for it and she like yes, so im like where do u keep the paper and she like in that bin, i search through it to find out that its not there so all the teacher can say is oh well if i find it ill change ur graded but till then ull have a 0% so yea i think this is bs what do u think guys.