I have completed level 1 and level 2 certifications ,Now i want to get model builder certificate what is the next thing i had to do to get model builder certification
First of all, congratulations on passing L2!
Via the academy you can take a virtual lesson of "the anaplan way", I've heard good review about this. So this is probably the best option.
There is also the option to do it in person via a classroom training provided by Anaplan or if your company invites a trainer. But that's very dependant on what's possible in your region due to COVID.
Will there be any exams in this or only lessons....
You need to get The Anaplan Way done. The Anaplan Way is an online course.