I am just beginner I want to score 600+ marks in NEET 2020 please give some guidelines and which concepts need to more focus

Till now, new dates for NEET 2020 has not been announced so you still have time to prepare for the exam. Instead of choosing a random topic from the syllabus, you must break your preparation into sections. Sub-topics from each section should be selected and then strategy on clearing concepts must be made. Never leave any concepts doubtful or unsolved. Once done with the syllabus and concept clarity, you should move towards solving previous years papers. Give mock tests as much as possible. Time management is one more important thing you should look upon. Remember that practise will increase your efficiency. Undoubtedly, NCERT Textbooks of Class 11 and 12 are best for preparation.
Go through this- http://medicine.careers360.com/articles/neet-preparation-tips