One must go through MCQ books for the basic preparation and you must solve previous year question papers. Lastly you must attend series of online mock tests to become perfect in NEET exam. From all these you can easily score 450+. I suggest you to take online mock test at https://www.beattheneet.com/
website as they have thousands of subject wise questions that cover all the topics. You have to just register and take their monthly or yearly packages.