My layman approach suggests you to consult "penguins dictionary of sociology" in order to get yourself familiar with terminologies and jargons, its not that big or thick, moreover every concept is explained in sufficient detail (as in books) unlike typical dictionaries and is easily available in cheap (60-80 Rs) paperback edition. Together with this you can keep ABDUL HAMEED TAGA'S or IQBAL CHAUHDHRY'S sociology for css.