Not to worry buddy I will tell you weightage of Physics subject in Birla Institute of Technology and Science Admission Test so that you can remember.

Here is the weightage of subjects

Chemistry
Chemical bonding 10%
Atomic structure 8%
P block elements 6%
Carbolic acids and its derivatives 6%
Mole concept 6%
Biomolecules 6%
Electro chemistry 5%
Chemical thermodynamics 5%
Solid states 5%
Chemical equilibrium 4%
Chemical kinetics 3%.

Physics
Heat & thermodynamics 10%
Magnetic effect of current & magnetism 9%
Current electricity 6%
Electrosatatic 5%
Wave motion 6%
Simple harmonic motion 5%
Wave optics 5%
Ray optics 45
Work energy power 4%
Rotational motion 4%
Elasticity 4%
Fluid 4%
Dimensions errors 3%
Gravitation 3%
Alternating current 3%.

Maths
Circles 11%
Continuity & differtiability 6%
Vectors 6%
Straight lines 7%
Pair of straight lines 6%.