Hey!There
You can realize same by yourself.Have a look to previous years paper of JEE MAINS and try to analyse yourself.70-80% questions comes from 40-50% syllabus of JEE MAINS.You can cover below mentioned topic for scoring 180+ score out of 300 in JEE MAINS:
PHYSICS:NLM AND FRICTION,ROTATIONAL DYNAMICS,WORK,POWER AND ENEGY,SHM,PROJECTILE,CENTRE OF MASS, ELECTRODYNAMICS AND ELECTROSTATIC,MODERN PHYSICS
MATHEMATICS: DIFFERENTIATIAL AND INTEGRAL CALCULUS, COORDINATE GEOMETRY, VECTOR AND 3D, TRIGONOMETRY,LIMIT, SEQUENCE AND SERIES
CHEMISTRY:You can cover all topic of physical chemistry as it is scoring and easy to cover:: INORGANIC CHEMISTRY-CHEMICAL BONDING,PERIODIC CLASSIFICATION,P,D AND F BLOCK ELEMENTS
ORGANIC CHEMISTRY-HYDROCARBON,ALKYL AND ARYL ALHYDE,ALCHO AND ETHERS,ALDHEDYE,KETONE AND CARBOXYLIC ACID..
If you cover above mentioned chapters then you can easily score 180+ score.And do appear in mock test to get real experience of JEE MAINS before EXAMINATION..
Ask if any query

Hello dear aspirant.

The lessons which are more important in JEE mains are very difficult to choose. I suggest you to focus on complete syllabus with the help of NCERT Book and solve previous year question papers as much as you can , it will cover automatically all important chapters and topics.

Good luck

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