I had fail in chemistry in 2019 if I pass in 2020 at all subject can i give the exam of neet

Chemistry is a completely conceptual subject. If you want to pass or get good grades all you need to do is spend about an hour everyday dedicating to chemistry. You need to be thorough with your textbook. If you follow ncert then be sure to be thorough with each and every line. NEET has a chemistry section which tests your precision and knowledge. So you not only need to study but also practice chemistry. Reference books can help. You have one year to go, do not give up , I am sure yoh can make it.