Rewrite the sentence using the correct mixed conditional form

Ex3: Rewrite the sentence using the correct mixed conditional form.
1. She didn’t prepare well for the exam, so she didn’t pass.
→ If she
2. If you don’t study hard, you will fail the exam.
→ Unless
3. I don’t have enough money, so I can’t buy a new car.
→ If I had
4. He didn’t practice enough, so he isn’t ready for the performance.
→ If he