I am in class 12 and preparing for neet as well but I don't know what to do to secure a considerable rank as I am focusing only on ncert

To crack the NEET exam you have to first develop a mind set to score above 600 to get into top medical colleges and 500 above for your state. To achieve this mind set you should have a plan to achieve it and a proper time table, with knowledge of important chapters which keeps more weightage and You should know which topic to focus upon smartly so that you solve maximum bigger mark questions.

Careers360 has come up with exclusive NEET Knockout Preparation Program,  with unlimited tests, online 24*7 expert chat facility system, conceptual e-lectures and many more plus points for you. It has a time table feature as per which you will have to choose the exam date and your complete time table will be auto-created as per what topic you should focus on and the amount of time to be given on each topic.

Apart from the above mentioned:

Be sincere with your routine, avoid procrastination.
In respect to the program mentioned, you can practice the tests any time of the day and that too unlimited, so utilize it to the extent.
There are concept wise lectures, which means you can get your minimal to important concepts cleared and followed with it can give the test and analyse your performance.
Even if you plan to study at 3am, and you face any query, you have online doubt facility system where the experts will help you asap and you don't have to wait till next day.

Further to know more benefits helpful for you, check details here- https://goo.gl/YzaqQN

Good Luck!