Hola, Primero, te recomiendo familiarizarte con todas las pruebas y tareas del examen, en la página del Instituto Cervantes puedes encontrar un modelo de examen y libros que te pueden ayudar con la preparación: https://examenes.cervantes.es/es/dele/preparar-prueba Y segundo, tener lecciones con un profesor para que te ayude y te aconseje en la realización de este examen. Por otro lado, Ver películas, leer textos relacionados con los que tendrás en el DELE, etc. es de gran ayuda. Espero haberte ayudado, Un saludo.

If you need material to study, there are free books here: https://espanolconamigos.blogspot.com.es/search/label/C?&max-results=12

Hello! I don't know what your current level in Spanish is, but C1 is quite high, so you might want to practice Spanish in a native speaker situation as being able to communicate is very important. If you get the chance, exchange as much Spanish as you can with native speakers from around the world. If you're living in a Spanish speaking country this should be easier for you. Otherwise, you might want to try as much language immersion as possible: listen to the radio in Spanish, watch films in Spanish without subtitles and read a lot of books. The more you do this, the better your Spanish will get. If you want to practice exam exercises, in the Instituto Cervantes website there are a lot of practice exams you can work with. If C1 proficiency level is you goal but you don't speak Spanish at all, all the above apply, but you might want to take it easier on yourself: learning a language takes a lot of time! So take a few lessons and complete that knowledge with your own work at home. The time you spend learning Spanish can also depend on whether you speak other languages as well and how close those languages are to Spanish. If you speak French, Italian or Portuguese, learning Spanish (especially grammar!) will be easier. If you speak Arabic, some of the vocabulary may be easier for you. I hope this helps! Buena suerte! C.