Record where the time went
After the mock, note which tasks took too long. Separate gaps in knowledge from rushed mistakes. In your next practice, track accuracy as well as speed.
Explain each mistake
Do more than copy the correct answer. Explain why your answer did not fit and which evidence you missed. Ask a teacher for feedback on writing and speaking.
Choose the next practice task
Choose your two most repeated problems. Practise them in short exercises, then retry under time limits. A mock result informs your study; it is not an official IELTS certificate.