These are the common mistakes that a NEET aspirant generally does
1] SOLVING QUESTIONS UNNECESSARILY OUT OF NCERT FOR BIOLOGY PARTICULARLY.STICK TO NCERT.YOU CAN READ LITTLE OUT OF NCERT BUT RELATED TO TOPIC .THE SAME IS FOR ORGANIC AND INORGANIC CHEMISTRY READ NCERT FIRST THOROUGHLY.FOR PHYSICS YOU WILL HAVE TO SOLVE QUESTIONS OUT OF NCERT BUT NOT OF JEE ADVANCE LEVEL
2] REVISE AS MUCH AS YOU CAN IT WILL HELP YOU TO REATIN THIS AND YOUR CONFIDENCE AND ACCURACY WILL ALSO INCREASE