Candidates are advised to book IELTS slots far in advance to avoid last-minute rushes. However, the IELTS administration allows applicants to book test slots 24 hours in advance of the scheduled exam.
Visit the IELTS website or the website of a company that is linked with IELTS, such as IDP India.
After creating a profile, you will be asked to choose the exam format (computer-based or paper-based) and type (IELTS Academic or IELTS General Training)
Keep your password and registered email address available for future usage. The email can also be marked as important since it will be needed in the future.