Question: Is there a system that offers prebuilt exercises and worksheets for multiple languages and subjects, and can be customized for individual students?

One of the top options is To Teach. It uses artificial intelligence to create learning materials and exercises that are matched to students' interests and abilities. It comes with more than 500 prebuilt exercises and worksheets that can be adapted with a single click, so it's adaptable for teachers. To Teach also supports multiple language levels and has several pricing levels, including a free option.

Another good option is Porosheets, which offers AI-generated worksheets with customizable subject matter, grade levels and number of questions. It can generate questions in multiple languages, including English, French and Arabic, and has features like automated lesson planning and live customer support. The service can save you a lot of time and help you assess students' knowledge.

If you're interested in language learning, WorkbookPDF offers customizable workbooks in 23 languages with a range of exercises and subjects. It offers printable PDF workbooks that can be used online or offline and are good for learners at any level. The service is good for teachers and tutors who want to create more complete language learning materials.