Scoring 400 is easier if you have all the basics right. All you need is to get 100 questions correct out of 180 without having a wrong answer. Focus more on Biology and Chemistry because during tie break situations, these marks are given preference. 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. 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. 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. Physics needs utmost focus and time because it involves with theoretical concepts and numbers. There should be a systematic approach in preparing for NEET. The important topics are Mechanics, ElectroDynamics, Modern Physics, Heat and Thermodynamics, Optics, Simple Harmonic Motion, Waves. Formulae form an integral part of your preparation. Memorise as many formulae as you can and write them down and stick them as post its so that you can always see them. Practise regularly and try various kinds of questions. Solving previous papers and mock tests to test your improvement. Keep a clock and check the time its taking you to solve these questions. And improve the time as you practise more. One day of the week should be set aside for revision so as to keep the mind fresh.