To prepare for JEE main you need to be well aware of the syllabus of JEE main you can check the syllabus of JEE main in the official information brochure available on the official website of JEE main.change it is last time preparation there for only study material you should follow right now is the previous years question paper because you will get the actual idea ofreal test if you go for any other study material then you will get concentrated on to a particular topic which is not beneficial right now just look at the previous years question paper and do as many as mock test you can so as to get the complete understanding of JEE main easily.