If you are asking about easy physics topics in 11 and 12 then as per my experience the easy ones are:

• Dimensional Analysis
• Newtons laws of Motion
• Waves and Oscillation
• Optics
• Modern physics (10+2) having Boolean Algebra, Elementary gate analysis, easy parts of elementary quantum mechanics. This are entirely formulae based.

May be you feel horrified with Newtonian Mechanics but if you understand the preliminaries of calculus and if you wish to invest some in it then it will get easier for you. Also try to practice as much problems as you can.

I hope this answer helps.