Dear Bidipta if you are study hard for Wbjee specily if you are aming physics,chemistry, and math and thoroghly solving the previous year question paper of wbjee. Then you surely get 175+score. Best of luck dear for your wbjee exam.

Here are few tips : 

* Study and solve last 10 year least, IIT- JEE and AIEEE paper's as some questions so get repeated.

* Don't do guesstimate's , as there's negative marking.

* Do continuous revision and improve your weak areas.

Here are few important topics : 

Maths :

* Vectors

* 3-D geometry

* Probability

* Limits

* Indefinite & Definite Integration

Chemistry :

* Chemical bonding

* Chemical kinetics 

* s , p, d, f bock elements

* Organics Chemistry

* Redox Reactions

Physics :

* Electrostatics

* Heat and thermodynamics

* Current Electricity

* Magnetic effects of current and magnetisation

* Simple harmonic and Wave motion

* Modern physics

* Work , Energy , Power.