Is anyone preparing Anthropology from Braintree Anthropology notes?

I read good reviews about the "Braintree Anthropology" printed notes. I am quite disappointed after I started reading from it. I agree the author may be super experienced in the field given the magnitude of his content. But, I noticed that there are many grammatical mistakes in the notes, especially with the usage of "prepositions" and "adverbs". Some people think it's not a big deal. But, there are a series of such parts of speech which appear with no reason at all in the sentences bringing ambiguity in the overall comprehension. 

Please don't criticise me for this post. I am just an aspirant who wants to know if I am studying from the good notes.

Kindly suggest how you are preparing for this subject. (Eg: Booklist or Video lectures)

Thank you.