Yes! Its a good subject !

Go for it & have a grip upon these trwo books.

Understanding of Psychology by Robert Feldman

(It covers whole Paper A & B excluding some topics from Paper B. By studying only this book I got 77 in Paper A)

Secondly, buy Sherbano's book (It 'll help you in Paper B and A as well )

Difference between two is

Shehrbno collected data from useful sources & put it in a cogent manner and easy language.

And Mr. Feldman can make you dive in Psychology by engaging you via examples from daily life.

Good Luck

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The thing always happens that you really believe in; and the belief in a thing makes it happen.