1. You can apply, and time is tight now. The preparation period is one year. Warwick application requires an application fee.

You need to pass the exam of Warwick to enter the undergraduate course. If you want to apply for another university, you need to pass UCAS.

3. One year. Your IELTS is not high, don't be complacent.

4. Even if the risk does not adapt to the course, you may have to go to another university. Probably ranked lower than Warwick.