Not enough information. We don’t know how the teacher calculates grades (straight line or a curve?). We also don’t know how many other tests and assignments make up the 77%.

So it’s impossible to tell how this will affect your grade without knowing more about how they are figured in the first place.

89.5% if they are equally weighted.

Not enough information.
How many chapter tests have you had so far, and are they equally weighted?

Google weighted averages, also find out if there will be a curve.

What percentage of your grade do your chapter tests contribute? I had one teacher who only graded tests and quizzes, and another who only made them 30% of the total grade. There’s really not enough information here.

You don’t tell us if the 77% is based on 154 out of 200, or if it is 1,540 out of 2,000. In the first case, 54/54 would give you a score of 208/254, which would raise your grade to 81.9%.

In the second case, it would give you a total score of 1,594 out of 2,054, which would raise your grade to 77.6%.

If this is in Math class, I suggest you ask your teacher for some help understanding how statistics work, and ho two frame a question on percentages.

I would assume there would be some weight also given to homework, attendance, no being annoying in class, etc.