Universities are always complaining these days that their new entrants have had no real preparation.
I don't know what to suggest for the grammar and punctuation, but for learning how to construct a proper argument and do some good reasoning,you can't beat this! Parents, buy it for your sixth form or undergraduate offspring. This is not to say, though, that you will not enjoy it too.
It is one of the most stimulating and enjoyable reads I have had for a long time. I am certainly putting Peter Cave's follow-up Eating People on my own must have for Christmas list!