One of the easiest ways to prepare yourself for any assessment is to practice, and the unfamiliar nature of the inductive reasoning test is one reason that candidates find it challenging.
If you know the publisher of the test you will be taking, find practice assessments designed for that publisher - otherwise, find general inductive reasoning practice tests to practice.
Practice will help you feel more comfortable with the type of questions being asked and allow you to develop your pattern identifying skills.
2. Exam Conditions
If you can, make sure that every practice test you take is under exam conditions. Set a timer so you get used to working under pressure, make sure that you are somewhere that you won't be disturbed, and turn off notifications.
It is normal for nerves to happen when you are in a test, but the more used to it you are, the more confident you will feel.
3. Take Your Time
You are likely to feel under pressure in a timed test, and this might make you rush through the questions. If you can, work out how long you will have for each question and make full use of that time to answer (if you need to) - so that you can avoid making any mistakes.
4. Get Used to Spotting Patterns
Our everyday lives are governed by patterns and sequences, and you can 'tune in' your inductive reasoning skills by spotting them around you.
A great way to practice spotting patterns is to complete puzzles, especially 'spot the difference'.