I have wasted 1 year can I score aiims

Yes you can still get a good score in AIIMS if you work hard and smart.

You still have almost 20 days in hand. Divide 3 subject into 18 days. 6 days for Biology 6 for physics and 6 for chemistry.

for 2 days complete the syllabus of class 11 and for next two aim to complete syllabus of class 12.
In next two days revise for all the chapters.

Your 18 days will be completed in the blink of an eye.

Try to give as many mock test as you can in the next 2 days.

Remember nothing is impossible

All the best!