using the examples of kitten and gees ,explain the idea of the critical period.

First remember, fluency doesn't mean quickly. fluency means properly then quickly.

In this speaking, the content is great. It covers everything. But seems you are rush to express your ideas.

The solution is:

first, be peaceful in mind. forget about marks right now, do whatever you can for this speaking. if you are thinking about the performance during talking, it will greatly affect the quality of speaking.

second, talk a little bit slowly, but confidently. less content will not make big problems for the marks if you can talk right on the point. but if you don't talk properly, you lose more.