Physics Today is one of the best magazines I have read while preparing for IIT JEE.As with every other thing, IIT JEE keeps changing.New topics get added and older ones get removed.With all the books being available being quite old ones that are being reprinted, such magazines do help.
Physics Today carries articles from the best faculty in India.Some of the articles are contributed by the best teachers for IIT JEE like from Bansal Classes, Vidhyamandir etc.With theory that is relevant, questions that come closest to IIT JEE type Physics Today is a must buy for any serious IIT JEE aspirant