My sister is preparing for NEET 2017 without any coaching.

Focus on NCERT book for the preparation as there are direct questions from the book

Clearing NEET is only in your hand; no coaching class and no preparation material can help you qualify the exam if you don't put 100 percent. Daily preparation and practice are essential if you are planning to rely only on self-study for NEET. Conceptual clarity is important for solving the sample paper/mock test correctly. The last month before the exam should be reserved for revision and focusing on important & scoring topics to crack NEET 2017. Focus, on NCERT books for your preparation it will help you to clear all your concepts and fundamentals. You can also solve previous year questions papers for your practice. To know where you stand among other aspirants, you can take mock test for NEET. You should not limit on the number of tests; take as many as you can. Initially start with chapter based and gradually move to full length tests.