Lots of schools are still using old fashioned reading schemes because they do not have the money to change over to a phonic scheme.
I think that ORT level 1+ is about right for a child who knows letter sounds and is learning to blend. If an ORT 1+ book has the word "frightening" in it, then it is not the teacher's fault. She is working with the reading scheme that she has been provided with, and of course a reception child would not be expected to read it.
I remember dd1 having a Ginn stage one book called honeybee. It had the words abdomen, thorax and antennae in it. I went to the teacher, very puzzled as to why young children were being given words to read that many adults would struggle with. She said that the purpose of the text was to familiarise children with non-fiction books, and of course reception/year 1 children were not expected to know technical terms.
If the numeracy homework was too hard, then let the teacher know. I am sure that your ds will be able to complete this by the end of reception, but at the end of the first month could be rather ambitious.