I got awas shock oned about my latest score of speaking test, score today.

“I got a shock” is a little awkward, and reads like it is in present tense.

Instead of on, about is the correct preposition (I was shocked about the test score).

“score of speaking test” sounds stiff and formal and “speaking test score” reads better.

Finally, there’s no need to put a comma before the word today.

Because, it was lower than I expected.

Correct, but this could be combined with the last sentence.
(I was shocked about my latest speaking test score today because it was lower than I expected.) In this case, there is no need for a comma after because.

So, I am reviewing my learning routines, and I am trying to change them to focus on more abouton speaking.

Add the subject to make it clear you are changing the learning routines.

I’m not sure how to explain, but “focus on more about” is grammatically incorrect. There is no need for “about”, since the phrase used is “focus on —.” The “more” should be placed in front of the “on.”

I can't use similes and fillers while I am talking.

Similes should be plural.

I shouldneed to practice to speaking in English a lot.

Should usually goes with more, like “I should practice speaking English more.” If you want to say “a lot,” then you should use “need to.”

I got a shock on my latest score ofToday, I was shocked because of the score on my latest speaking test, today.

Because, iIt was lower than I expected.

You can also combine the previous sentence with this one:

Today, I was shocked because the score on my latest speaking test was lower than I expected.

So I am reviewing my learning routines, and I am trying to change to focus on more abouton speaking.

I cadon't use simile and fillers while I am talking.

As a result, my sentences seem like I'm reading from a textbook.

I should practice to speaking in English a lot.

Thinking About My Learning Progress

I added "progress" so that the title would better reflect your learning expectations and process.

I got a shock onwas disappointed with my latest score ofn the speaking test, today.

"Shocked" is fine, but "disappointed" is a more accurate term for what you're feeling.

Because, it was lower than what I expected.

So I am reviewing my learning routines, and I am trying to change to focus on more abouty speaking skills.

I can'tseldom use similes and fillers while I am talking.

"Can't" as a modal verb expresses the ability or possibility to do something. While it is technically correct to use it in this sentence, "seldom" would be more natural. You can also replace "seldom" with "never" or "rarely," depending on how often you do the action stated.

As a result, my sentences seemI sound like reading a textbook.

I should practice to speaking in English a lot.