Dear Manoj, no question is a silly question. Biology is the biggest section in NEET, comprising about half of the exam, and acing this subject can help you in scoring more in the exam. NCERT is best book to study biology for NEET, and solving NCERT based questions will give an added advantage. Human Physiology and Genetics have maximum weightage in NEET. It is advisable to practise questions of Genetics from previous year question papers, which will give you a thorough understanding of how the questions are being asked. Topics of Plant and Animal kingdom have a lot of portion to memorize. You can prepare these topics by making a comparative table for the sub-topics and studying it together. Plant physiology is also equally important and easy to score. Try to learn the formulas and derivations, so that you can solve problems in one go. A smart, thorough approach towards Physics section can significantly boost your rank. Chemistry is a tedious subject and requires a lot of visualization which makes it difficult to comprehend for some. If someone is well versed with the type of questions and has practiced last 10-year exam papers, he/she can confidently attempt all 45 questions. Chemistry is divided into Inorganic, Physical and Organic chemistry. For inorganic chemistry, you must refer to the NCERT. Organic comprises of many reactions and reagents which can be practised by writing over and over again. Physical chemistry requires a comparatively deeper understanding of concepts, so preparing with the NCERT and referring to study material a level higher than NCERT should be the way to go.