Since you've completed 11th and 12th in PCB and NATA (National Aptitude Test in Architecture) requires Maths for Goa colleges, here are your options to pursue Architecture:

1. Explore Other NATA Accepting Colleges: Not all colleges require NATA, especially private ones. Search for architecture colleges outside Goa that accept students based on alternative entrance exams or merit. The Council of Architecture (COA) website lists all accredited architecture programs in India.

2. NIOS On-Demand Exams: While Goa might not accept NIOS Maths, some other colleges might. Check with colleges you're interested in if they accept NIOS on-demand exams for Maths. NIOS allows appearing for specific subjects outside the regular academic session.

3. State-Level Architecture Entrance Exams: Some states conduct their own architecture entrance exams. Explore if any states near you have such exams with a PCB eligibility and contact the conducting body for details.

4. Alternative Design Courses: Consider related design fields like Interior Design or Fashion Design that might have less stringent math requirements. Research entrance exams for these programs.

Remember: Contact the colleges directly to confirm their eligibility criteria and entrance exams accepted.

These options provide pathways to your architectural aspirations even without appearing for NATA Maths in Goa.