Hi, It’s for sure that the questions that are designed for the paper of neet-UG paper are from CBSE set syllabus only but attempting the question paper and scoring good marks in medical UG examination are 2 different things. I’ll suggest you to join a coaching institute, preferably Akaash,Target PMT or Allen. These are some of the Top notch institutes in India for medical coaching. Else by reading out CBSE question you’ll be surely able to attempt the question paper but getting more than 500 marks out of 720 is not a easy walk on the road. Also mars more than 500 does assure you that you’ll get a seat in MBBS but it’s mostly in one of the farthest corners of the country where your parents and you won’t be much interested to go. So, set an aim of about 550 marks in NEET-UG paper and join in any one of the above stated institutes and study with full sincerity and you’ll do great in this field.