Please refer to the programme of study on the digital archway to see what you'll be tested on:
https://digitalarchway.ardingly.com/science-1/biology/igcse-biology/shell
Pages 1 - 3; 9 - 11; 16 - 21
If you want to use practice questions: Page 14-15 questions 1, 4, 5 and 6; page 22 questions 1-3; pages 22-25 questions 1, 4, 7 and 8. You don't have to do these questions - but you might want to use them to help prepare for the test.