Tonight on a new sim I also got the confused moodlet reading from logic 2 after reading logic 1 until I had skill at 3 -- however, reading logic 1 won't give him any additional skill ... the skill % does not increase. He's gone to play chess. I will keep testing the skill book 2 and see if/when I can read it.
The 2500 simolean cooking recipe books are very confusing. I got these after my cooking was at 10, and read them 2-3 times on my more advanced sim and she got a 'bored' moodlet and got irritated that I was making her do something so unfun. So if it costs 2500 simoleans to buy/read these books, what exactly is it good for? I've gotten the mixology book (and socializing tips book) and will try those on the sim with no skill in those areas. It's very confusing what these are supposed to be doing.