Enough might mean just enough level to scrape off a okish score in JEE Advanced or it might mean good enough to score 90% in JEE Advanced.
Going by my personal experience, you can clear INPHO if your concepts of physics are strong enough and you can apply them practically. So, in a word, yes. JEE level physics can get you through, however syllabus completion and a large exposure to tough problems is a must. Continue reading Is JEE level Physics enough for InPhO ?