Hello aspirant

According to me right now, you should focus on clearing your 12th physics concepts because it will help you in both boards and neet. Also take two hours everyday or every alternate day to try understand one chapter from 11 physics once so that after a month you are have covered your 11th too.

Keep your main focus on 12 physics and do 11 physics as a break time from your 12th topics. First finish off with small chapters like ktg, thermal properties of solids, fluids,matter, thermodynamics. These are comparatively short chapters and contain a relevant portion in neet. Do smart study.

Hope this helps