Hey there , Well to get admission in any Architectural college ,yes, you need to give the paper 2 of JEE mains ,

According to the jee score your college will be decided.The second option is NATA exam.

To get admission in JJ college of architecture, one must undergo the following steps:

1. You should Score well in your 10+2 PCM (atleast 50%)

2. Secondly,You should have a valid score in your Jee Maine paper 2 

3. You should score atleast 50% I.e 80/200 Marks on your NATA exam ,which will further be followed by the counselling program 

All the best!