hey Simmi Gautam 

Do practical physics portion of +2 standard. It has simplest questions in physics portion you just have to apply formula in given data and answer would be come.

It is also high scoring portion.

Than clear electric and magnetic related chapters, these may consume some time but once you have done it, you don't even need to study it at the time examination.

Do mechanics portion properly and be neet exam oriented. Don't try to waste time by doing jee questions instead use that time for reading biology ncert.

Cover thermal related chapters only surface level. Don't go in depth for these chapter, there are just surface level questions are from these units.

Solve previous years questions papers of atleast 10 years of aipmt.

Than cover chapters which deals with optic phenomenon.

Another scoring portion lies in semiconductor based chapters.

Which are just to learn and merely calculating you would get 12 marks easily.

If you follow these steps well you would be scoring above 140 easily.

For chemistry :

Organic chemistry should be learn proper by you.

For that you should MUST understand the phenomenon like conjugation, resonance, hyper conjugation, and electromeric effect, and induction effect.

If you know these phenomenon complete than you won't have any problems in solving any questions of organic chemistry.

Solve the read every word of +2 level chemistry Ncert part 2 for organic chemistry.

For inorganic chemistry you must have knowledge about CHEMICAL BONDING, HYBRIDISATION, PERIODIC TABLE,.

After this you only left chapter for mugged up which include all s, p, d and f block elements.

Than focus on Co ordination chemistry which is related to somewhat chemical bonding.

Than you would be left with chapters like polymer, receptor, drugs in ncert part 2 in +2 level.

There are some questions asked on chapters dealing with packaging of atoms in compounds which are given in part 1 of chemistry Ncert of +2 level.

YOU MUST DO PREVIOUS YEARS QUESTION PAPERS OF ATLEAST 10 YEARS.

You will easily score above 150 if you work continuesly.

Best wishes