Hello,

Definitely class 12th!

But you need to look out well for the following topics from class 11th.

Chemistry :

• General Organic chemistry
• Isomerism
• Thermodynamics(Common in Physics) n Equilibrium
• Structure of Atom (Common in Physics with Modern physics)

Maths :

• Conic section n coordinate geometry.
• Trigonometry
• Complex numbers

Physics :

• WPE & Rotation
• S.H.M. & Waves oscillations

Hope this helps.