focusing on your class 11 marks is not that much nessecry but u should score 90% in your class 11 th examinations 

to start preparing for NEET u must do MCQ's daily and should always follow NCERT text books for refernce 

Hello Trisha,

You should start your NEET preparation. First of all, you should read NCERT books of Physics, Chemistry & Biology of class 11th & 12th at least 5 times. You should also try to solve the previous years question papers again and again, and start giving mock test. In this way you will prepare yourself for the board examination as well as for the NEET exam.

Thank you

All the best