Hello Sonu,
NIT,  Warangal doesn't offer B.arch course, however, NIT, Trichy does offer B.arch.Considering previous cut off trends you need to get a rank below 300 to get seat in NIT, Trichy. JEE mains paper 2 consists of

• Mathematics
• General aptitude
• Plannig/Drawing skills.

An architecture must possess creativity skills, numerical ability, critical thinking, general awareness, imagination, communication skills and drawing skills.As you are saying that you are weat at drawing it maybe hard for you to study this course.Do not be discouraged, if you are really interested in architecture you need to develop the above skills.
And about exam preparation go through the syllabus once and see previous years papers, practice the questions and give mock tests.
I hope this is helpful to you.

NIT Warangal

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