A lot of books are made in that purpose. You should look it up on the Internet. Now, in addition to learning with these books, keep in mind that the DELF is aiming to evaluate your French level. So what you could do is try to imerge yourself in the French language by listening to French a lot (watch TV shows, listen to the radio,... and learn from them) The more you will make French a part of your daily life, the more familiar it will become to you. Some DELF books are great (and sometimes necessary depending on the learner) because they focus on the material which appears in the DELF and they let everything that is unnecessary appart. However, this doesn't mean that additional knowledge won't help you pass the DELF. So I suggest you buy a DELF dedicated learning book (If you feel that it's necessary for you) and work on making French part of your daily life as much as you can.
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