How can I prepare for NEET and AIIMS throughout the 3 years of my Bsc?

I don't understand why you are waiting for 2021 to give your entrance exam. You should attempt 2017 NEET exam or 2018.

For preparation,

**Prepare a Preparation Schedule**: You must follow a strict preparation schedule owing to the scarcity of time. You must assign a fixed amount of time to a fixed number of chapters and complete the chapters as per the designed schedule.

**Review & Solve Previous Years' Papers**: This is the best way to boost up your preparation owing to the scarcity of time. You must study and solve 10 previous years' papers of AIPMT. This will help you get acquainted with the pattern of questions asked and the difficulty level of questions asked in NEET exam.

**Study the Right Material**: You must refer to NCERT books for all the three subjects. You must also refer to additional comprehensive books for practicing MCQs.

**Build Your Concepts **: You must develop a strong base in all the three subjects and must clear your concepts. This would greatly help you in solving conceptual questions.

**Practice**: You must practice a mixed bag of MCQs from different comprehensive books.

**Focus On Important Topics**: Owing to the scarcity of time, you must focus on the most important topics.

**Physics:

**Oscillations and Waves, Magnetic Effect of Current and Magnetism, Electronic devices, Kinematics, Heat and Thermodynamics, Electrostatics and Current Electricity. Oscillations is an extremely important topic, fetching a huge weightage every year. Take care to be thorough with these!

**Chemistry:**

Organic Chemistry (IUPAC nomenclature is a key type of question), Chemical Bonding and Molecular Structure, Coordination Compounds, p-block elements, Equilibrium, Biomolecules, Aldehydes Ketones Carboxylic Acids, Alcohol Phenol Ether and Chemical Kinetics. Also, questions from quantitative analysis are frequent, and they catch students off-guard. Just remember that they can be solved by using basic titration methods!

**Biology:**

The Living World, Biological Classification, Chemical Control and Integration, Principles Of Inheritance And Variation, Molecular Basis Of Inheritance, Cell and Sexual Reproduction In Flowering Plants.

**Take Online Mock Tests: ** This is the key to success in the NEET exam. You must attempt online tests on a regular basis. This will help you evaluate your current preparation level and help you identify the areas where you need improvement.