Giving a Letter Grade based off Cells

I am currently working on a project and cannot figure out how to solve it. The project has me assigning a letter grade based off grades that a person will input in a cell. I have written code that I think will do the job but it will only display an "F" where it should be an "A" or a "B". Any feedback or suggestions would be greatly appreciated. Below is what my code currently looks like. I am not looking for someone to do the project for me but rather I am stuck on a step and am seeking help on a solution.

EDIT
Since the code looks weird and not formatted correctly I have attached an image which shows what the code actually looks like

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Administrative Note:

Welcome to the forum.

We would very much like to help you with your query, however you need to include code tags around your code.

Please take a moment to add the tags. Posting code between [code]Please [url=https://www.excelforum.com/login.php]Login or Register [/url] to view this content.[/code] tags makes your code much easier to read and copy for testing, and it also maintains VBA formatting.

Please see Forum Rule #2 about code tags and adjust accordingly. Click on Edit to open your post, then highlight your code and click the # icon at the top of your post window. More information about these and other tags can be found here

(Note: this change is not optional. As you are new here, I have done it for you today.)

Do NOT remove edits that a moderator has made. You are REQUIRED to enclose code within code tags. I will add them again - LEAVE THEM ALONE this time, please.

I have also removed the completely unnecessary image taking up so much room.

I do not replicate the error. What is the value of Score when you get an incorrect result? My guess is that Score contains something other than the value you think it does, which is probably a bug in the calling procedure (not shown in your OP).

Here's my test procedure

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It has been resolved by me - THREE TIMES now, and the OP keeps removing them.

Please go ahead with the suggested solution.

Thank you.