The short answer
Approach practices whose built work you can discuss, send a short tailored portfolio, and treat the placement as a site-experience opportunity.
Shortlist practices whose built work you genuinely know, and write to them with a specific reason for applying plus a compact portfolio PDF. Cold applications work when they show you have looked at the practice’s work.
Prefer placements where you will visit sites and produce drawings rather than only rendering. Ask before joining what the internship involves, and confirm the Council’s required internship duration is met.
Continue on Architects In India