Grammar Answers:
1. must
2. must
3. might
4. could

Reading Answers:
1. Success comes from daily habits and discipline.
2. He believes anyone can improve their life.
3. To encourage the reader to take responsibility.
4. That he is positive and motivating.
5. To show success requires consistent effort.

Listening Answers:
1. Nervousness.
2. B believes A has improved.
3. More time.
4. A is ready for the exam.