There are two very important questions.

First, which school are you from?

No matter whether the school has strict requirements for thesis defense, I will focus on the atmosphere.

Second, who is your tutor?

Whether the teacher is flexible or rigid, I mean accommodating.

On the basis of the answers to these two questions, you can grasp them yourself.

If all the answers are negative, then you must come to the tutor's house and ask for leave humbly. Please give me some advice and correct it later.

If all the answers are yes, you can muddle through.

One right and one wrong, you can easily get through by taking bribes, whether it's up or down.