Hello Himanshu,
The Age limit for UG courses at Guru Gobind Singh Indraprastha University (GGSIPU) - Not be more than 21 years or less than 18 years.
So, if you have cleared your 12th boards in 2016, then you'll probably be 21 years in 2019 and hence it is the last year you can sit for this exam.
Hope this helps.
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