Wrong. Part of the test is language skills.
You will read some English during your life, will you not?
You will speak some English, will you not?
You will need to write in English, will you not?
You are going to vote, are you not?
Don't you think it is important that new Americans know about the US Constitution, how the government is set up, what rights you have as an American? The citizenship test is not only a test. It is also a condensed method of education about the United States.
You seem to think an immigrant should just be able to buy their citizenship status with no test. Frankly, I find that thought distasteful because it cheapens citizenship. The citizenship test means a great more than just fees paid to the government.