No one can see your screen, your tax return or your account, so we cannot assure you that you prepared your return correctly. TurboTax is do-it-yourself software that does not know if you type a wrong amount, add an extra zero, misplace a decimal, leave out income, forget to enter a dependent, neglect to enter data, etc. etc. The calculations are accurate based on what the user enters.
As for your fees:
How can I see my TurboTax fees?
Your post does not indicate what version of the software you used, so not sure how you have fees of $242.