Is reading novels helpful for GRE Preparation? I'm going to start preparing for GRE. I have great enthusiasm for reading novels rather than memorizing words. Will words learnt from novels be helpful for GRE vocabulary? Which novels/writers books should be read for GRE vocabulary?
No doubt you can encounter useful words in novels, but you will encounter them at a much slower rate than with targeted study.  If your goal is to learn GRE words quickly, a simple GRE study book would be more efficient.  At the least, you should take a practice GRE test and see how you do on the vocab sections.  If your vocab needs major improvement, reading novels is probably too slow to be of use for passing the GRE.

In the long term, I think reading novels and other texts is a better (and more fun) way of learning how to actually understand and use a wide range of vocabulary, but for the short-term goal of improving your GRE score it may not deliver as much benefit.