Yes i'm guessing so, because limited time is just 1.5 hrs for maths and aptitude i.e 60 questions i don't think maths is not gonna be much tougher for this limited time.

According to NATA 2018 brochure, (page 6, point 5)

Candidates may come from the following backgrounds: (a) 10+2 or equivalent passed/appearing; (b) 10+3 Diploma (any stream) passed/appearing recognized by Central/State Govts; (c) International Baccalaureate Diploma passed/appearing, after 10 years of Schooling.

Even on being from arts stream you can write NATA provided you have Math and English as compulsory subjects.

Carry ur shading pencils of all the grades u want.U also hv to carry ur protractor and compass in case ur nt habitual to free hand drawing.Carry ur colour pencils fr d imagination drawing.I guess thats all u need to carry!!I gt to know dat many centres dnt allow students to carry scale,Im sorry idk d reason so u carry a brand new pencil so that u can use it like a scale in case of any problem...

All the best!!

try practicing them frm all d qustion papers...d sample papers,mock papers and all d others...it really helps!!

It ws allowed till last year bt I guess that it is ntallowed dis year.And it is better u dnt use it as it might spoil ur sketch if d shading doesnt come out well.It is also difficult fr d invigilator to scan it as when d paper is wet they cannot scan it and even if they scan it and it is spoilt,v cannot blame them.Bt I guess it is ur wish.U can use it if u believe dat ur gud in it.

All d best!!

Qualifying marks for NATA-2018 would be based on the following rules:

1. A minimum of 25% must be secured in MCQ portion (30 out of 120)

2. A minimum of 25% must be secured in Drawing portion (20 out of 80)

3. Overall qualifying marks (out of 200) would be based on post-exam statistics and at the discretion of the Council. 

http://www.nata.in/NATA2018-Brochure.pdf