Hello Himanshu,
No,the attendance of class 12 is not required for appearing in NEET and AIIMS exams. The attendance are important only for boards. The attendance is important for writing boards exams. you also get marks for attendance in boards. And if your attendance is not good you wont be allowed to sit for boards exams.
attendance dont affect your chance of sitting for neet and aiims exams.
hope this may help you.
Hey there
There is no such rules but schools force students for attending classes in order to seat in boards. Also school is an important part of life you should not miss it. You will learn something from school.
Check about neet
https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/exams/neet/articles&ved=2ahUKEwjQ2eLUw6_jAhURfysKHfXPB0oQFjACegQIAhAB&usg=AOvVaw0laqmZBKKx_qq07oCuxtI-
Check about AIIMS
https://www.google.com/url?sa=t&source=web&rct=j&url=https://medicine.careers360.com/exams/aiims-mbbs&ved=2ahUKEwj5qqHjw6_jAhUMb30KHWCkCCcQFjAMegQIAhAB&usg=AOvVaw1ls9_2lfaLG4_fNP1Q3wMI
Good luck
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