Dear Usman,
Since you have asked this question eight months ago, I hope you have got admission in decent architecture college.
For joining the Architecture programme, basic eligibility required is students should have passed 10+2 with PCM. Entrance exams are conducted for admission to the course. Students can apply for JEE Main examination which is conducted annually. Most Institutes including IIT, SPA, admit students on the basis of merit of score obtained in JEE Mains exam.
National Aptitude Test in Architecture (NATA) is also conducted for admission in recognized Architectural Institutions across the country.
Some Universities/Institutions can conduct their own entrance test also for admission to the course.
After Undergraduation, you can opt for postgraduation if you want to pursue higher studies or can start working.
Good Luck!
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