If you have less time then just focus on your 12th part.

For Physics:

Current Electricity

Elecromagnetic Induction

Capacitance

Ray Optics

X-Rays

Radioactivity

For Chemistry:

Mole Concept, Solution

p-block Elements

Redox Reactions

Alkanes, Alkenes and AlkynesAlkanes, Alkenes and Alkynes

Aldehyde KetoneAldehyde Ketone

Carboxylic Acid and its DerivativesCarboxylic Acid and its Derivatives

Periodic Classification Of Elements

Atomic Structure.(It is basic part, so try to finish it first)