Hi you have plenty of time, and if you work smart, you can really score well easily, i will tell you how to prepare for both NEET As well as AIIMS,

Physics and chemistry- physics is considered one of the toughest subject for medical aspirants,but very interesting. choose any good book of your convinience, there are plenty of good books as many mentioned already. read the concepts thoroughly,understand them cover to cover, if you have doubts, clear them then and there. solve atleast 300 to 500 questions per chapter, check ,analyse and rectify your mistakes. solve again. the more you solve the merrier.initially you wont be getting many correct answers, but as you keep on doing am sure you will see your score rising. solve previous question papers too

Biology-aiims doesnt cover most part from ncert like how neet does, in neet around 300 marks are from ncert text book itself, so u need to thorough ncert first and then read any good book of your choice and solve as many questions as you can

General knowledge and current affairs(AIIMS ONLY)- read newspapers regularly, keep yourself updated always, use year books, they ll help you alot.

To prepare for NEET 2017 you must be aware for all relevant information related to the exam like- Paper pattern, Syllabus, Important topics with their weightage.

To improve your preparation level you must be aware of your strong and weak points. Your concepts  should be clear and you should focus on important topics. You should evaluate your performance on regular basis for that you can take help of mock tests.

To improve your preparation level and to know your strength and weakness with recommendations and suggestions you can also use below NEET prepmeter.

Click on the below link to use- www.medicine.careers360.com/prepmeter/neet-ug?icn=neetug-cp&ici=forum