Students' Choice, JEE Chemistry Tutor. Chemical Engineer & Researcher
To read theory strictly use textbooks or class notes. Do not read it from any other source. Also, to solve problems use the material with which you are comfortable. If I have to choose then I will use FIITJEE, but you have to make the choice. As no material is bad or good. Its about how much you are able to learn from it and how can you improve your skills further.