Hello,
Yes, a regular student can crack NEET UG/AIIMS exam. You just need to balace your preparation. Divide your time according to the chapters and devote time to each subject. With a scheduled  study plan, you can definitely clear the exam. Focus on clearing the basics and go through the NCERT text books. It will help you for the NEET exam as well as your board exams. You can also take help from school teachers/ friends if you are facing difficulty in any topic.
Go through the interviews of NEET toppers using the link below for reference-

https://medicine.careers360.com/articles/neet-2018-topper-interview-himanshu-sharma-air-3

https://medicine.careers360.com/articles/neet-2018-topper-interview-kalpana-kumari-air-1

Good luck!

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