Is there any other exams for Achitecture other than B.Arch?
No.
To get admission in architecture you wil have to pursue B.Arch program only and there are various exams which an architecture aspirant can apply for to get admission in B.Arch program -
Jee Main paper 2
Jee Advanced (AAT)
Direct Admission for students abroad (DASA)
National Aptitude test in Architecture (NATA)
Also, state and university level entrances are there as well so please tell which particular state you belong to?
Good Luck!!!