I have scored 84%tile in Barch and 75% in 12th board, so can I get government architecture college
You got 84 percentile in Jee paper 2 & 75% in your board examination.
According to the rank formula i. e. rank = (100-percentile) * (no. of students) /100.
Now, as the total no. of students is 145386, you rank should be around 23.2k.
Now, look, you can't get nits with this percentile score but you may get good private colleges.
You may go through this college predictor tool.They may help you:
All the best !!