Can I get in AIIMS Delhi if I have wasted 7 months of class 11?

Yes, you can get into AIIMS even if you wasted a few months of your class 11. My brother wasted his entire year and was in an even worse situation. You need to realize that even if you wasted 7 months you still have an entire year to prepare. 

Some may not agree but I believe one year is enough to prepare for M.B.B.S. in your dream college. All you need to do is become very serious about your goal and remove all distractions from your life. The harder you work the more chances of clearing NEET. It’s better to start preparing now than wasting time on asking such questions. Every minute counts. Since your dream college is AIIMS Delhi, the journey is going to be all the more tough. You’ll have to sacrifice a lot on the way. Completely give up on social media, parties, and hangouts. Your sacrifice will be paid one day so just focus on working hard now. 

Make a proper timetable and follow it religiously. Make sure you have revised the syllabus at least 4 times before giving the exam. Don’t follow anyone’s schedule as every human being is unique. Lastly, don't waste your time asking people if it’s late or not. Remember, ‘Better late than never‘.