Hi aspirant 

If you want to make career in architecture then you need to apply for JEE mains paper 2.But you won't be able to take admission through that at IIT Mumbai.

IIT Mumbai offeres Btech programmes for :

• Aerospace
• Civil
• Mechanical
• Electrical
• Computer Science
• chemical
• Metallurgy
• Physics

Inorder to get any of these you will have to give JEE advance and score should be within 1000 otherwise its not possible.

Other architecture college are there you can check their JEE mains paper 2 cut off here:https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning

Prepare for JEE Mains/Advance.

Hope this helps you.