Rebellion what is the cause?

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I sister called me yesturday to complain about her eight years old son, the first week of school he was very good and his teacher was happy. This week his teacher called my sister to complain about a list of offences - He took his shoe off and complained it was tight when he was asked to put it back on, so the teacher sent a note to my sister telling her he could wear a pair of sandals to school. They were not tight, they are in fact a little bigger than his size and were bought the week before. The teacher was surprised to see him in them the next day. She asked him how they felt and he said they are fine. - He refused to do the work on the board, he claimed he could not do it. But it was just additional work to the same work he had just done. He refused to even try. - The school was entered in a spelling B, his teacher felt he was very good and wanted to take him, he told her he was not interested and would not be going. After he said that the other boys in the class put their hands up and said they were not interested. I think he is acting up, she just moved in to a new place with my mother, her daughter and her son. He daughter had been with her all the time she is younger, but her son had been with his father. He claimed that his father was to hard on him and my sister was upset. The firest week when he did well he was with his father, the first week of bad behavior is with her. I told her is is testing the boundaries and trying to see what he could get away with but maybe there is more I don't know. he was happy to leave by his father but maybe that was the best place for him.