Hello,
NATA score is compulsory for admission into B.arch courses. As you have missed the NATA exam this year, it would be hard for you to get admission into b.arch. You won't be getting into government or state colleges for b.arch.
Some institutions like LPU, Sharda, Amity might take admission into B.arch without NATA based on their own entrance test but they might take donations during the admission.
You can also appear for NATA next year as it opens up a wide variety of choices for you.
Here's a link for preparation strategy for NATA
https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/how-prepare-for-nata-2020/amp&ved=2ahUKEwj4jJONxdjpAhUyg-YKHdZiCy8QFjATegQICxAB&usg=AOvVaw1nyg66w15mBx-QU0yTN7Zx&ampcf=1

Hope it helps

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