Hello

Admission to b.ed is done on the basis of entrance exam in topmost colleges and various states also organises state level exam. However some colleges also provide admission on the basis of marks obtained in graduation or postgraduation.

Here are some state and University level exam list but most of exam has been over .

Bihar b.ed cet
UP b.ed jee
TS EDCET
AP ED CET
CUET - for central university like du,bhu.
JMIEE - Jamia millia Islamia
IPUCET - Guru Govind Singh Indraprastha University.
IGNOU b.ed

As you haven't mentioned your desired state or University it would be difficult for me to find website.
So , please mention it.

Thanks