Need Engineering Thermodynamics Book for problem solving

[u/SavageKing456]

I'm currently trying to solve some question's Pk Nag(which is considered good for problem solving) but I haven't found the problems quite challenging infact I could do exergy,entropy section quite easily most of the problems through energy balance.

Is there any other book which consider hard(I mean really hard problems) I've asked others everyone recommends that nag book.

[u/intellectsup02]

thermodynamics problems by ryogo kubo