Ganong is one of the best books you can refer to for physiology. If you like foreign authors, textbook of Medical Physiology by Gyton and Hall is also excellent. If you want to try Indian authors, I suggest you go for GK Pal. It has easier text as compared to foreign authors. A more easier textbook would be the one by Sebulingam. You should purchase a separate textbook which has all the MCQs asked in previous years NEET papers.