Have you heard of graded readers? These normally have comprehension questions at the end of chapters. All big publishers have them (OUP, Cambridge, penguin, Routledge etc as well as smaller players) and check they have the questions.
And get the right CEFR level. IELTS 5.5-6.0 is about B1, 5.0 is B2, 6.0 is about C1. Publishers use different scales which is a pain
Plenty available from your usual bookshops. Will give you my recommendation is you want