Hello sanchita, 

The ultimate selection of NID DAT is decided throug the compilation of candidate's  Both prelims and mains score .

DAT Prelims -30%

DAT Mains -70%

As you have mentioned your prelims score you will get idea of your selection through the cutt off  of the nid dat 2019  please refer our site for your queriehttps://design.careers360.com/articles/nid-dat-cutoff

And as you've asked the drawing section has 30 marks you have to draw and colour something according to the question as an answer in the provided displace. Commonly they ask 3/4 question in this section 

Based on your score of prelims eligible candidate shortlisted for DAT mains. You need to wait for the mains exam to happen then based on that it would be easier to decide you will get the admission or not. For further  information on selection process and exam you can go through this link https://design.careers360.com/articles/nid-dat,

Good luck