Here are the corrected sentences with mistakes identified:

1. I would like to **go to** a school **as** the one my sister **goes** to.
**Correction:** "as" should be "like" (B)

2. It is **enough.** I don’t need any more advice from you. You just don’t understand the problem.
**Correction:** "It is enough" should be "That is enough" or "It's enough."

3. My feet are really cold. They’re **as** blocks of ice.
**Correction:** "as" should be "like" (B)

4. The Boeing 747 is **twice bigger than** the Boeing 707.
**Correction:** "twice bigger than" should be "twice as big as" (B)

5. Bad news **don’t** make people feel happy.
**Correction:** "don’t" should be "doesn’t" (A)

6. We will be going to the library at 8 a.m. **in** Sunday, and they will, too.
**Correction:** "in" should be "on" (B)

7. He made the soup by **mixing little** meat with some rice.
**Correction:** "little" should be "a little" or "some" (B)

8. Marion **once had a part-time** job like a tour guide.
**Correction:** Correct as is. (No mistake)

9. This yogurt isn’t **as well as** the one I bought yesterday.
**Correction:** "as well as" should be "as good as" (C)

10. I’m sorry, **sir.** Your recorder isn’t ready **yet.** We haven’t **got** anyone **repair** it.
**Correction:** "got" should be "have," and "repair" should be "to repair" (B & D)

11. Would you like **any** sugar in your tea? – Yes, please. Just **a little.**
**Correction:** "any" can be "some" for a more positive context (A & D)

12. Columbus made his first voyage from Europe to America **of** 1492.
**Correction:** "of" should be "in" (D)

These corrections ensure proper grammar and clarity in the sentences.