According to Student Handbook of NIT Calicut for the year 2018.

For admission to B. Arch. programme of NIT Calicut through JEE, the candidate should have secured a rank in JEE (Main) 2018 Paper- 2 and satisfy at least one of the two criteria given below: 

1. The candidate is within the category-wise top 20 percentile of successful candidates in their respective Class XII (or equivalent) examination of respective stream and Board with Mathematics as compulsory subject. Further, candidate should have passed each subject individually.
2. The candidate has secured minimum 75% (for GEN or OBC-NCL) or minimum 65 % (for SC, ST or PwD) of aggregate marks in the Class XII (or equivalent) examination of respective stream and Board with Mathematics as compulsory subject. Further, candidate should have passed each subject individually. 

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We are expecting a notification from COA in few days... You can also refer www.nata.in for the same

JJ College of Architecture is the best college for architecture in India.

The FDDI college is a good college for students considering to pursue Design as their career.

There are no changes in NATA exam except that it is getting conducted twice this year.

Yeah. You get your rank based on an average of your boards and nata score. So try and get maximum in both areas to get a good rank.