Glossary entry (derived from question below)
Portuguese term or phrase:
salas multisseriadas
English translation:
multi-level classes
Portuguese term
salas multisseriadas
"As classes multisseriadas são salas com alunos de diferentes idades e níveis educacionais nas quais estão cerca de 60% dos estudantes do campo."
Proposed translations
United States
BA in Transl., MA in ESL, 15 yrs of exp.
Native in: Portuguese 
Works in: English to Portuguese, Portuguese to English, Spanish to Portuguese, and 2 more.
multi-level classes
Miles takes a collaborative approach to education, involving parents, faculty and the community in decisions about the school. Students also work together in the classroom. Multi-age, multi-level classrooms allow students to stay in the same room for two to three years. This helps them build confidence and enables teachers to offer more challenging material as children progress. Students with hearing differences are co-enrolled in all grade levels.
https://milesk8.tusd1.org/ContactUs
multi-level class: Group of students who learn and study together in one room, despite having varying levels of abilities and/or literacy backgrounds.
https://www.englishclub.com/teaching-tips/teaching-multi-lev...
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Brazil
Passionate, reliable
Native in: Portuguese
Works in: English to Portuguese, German to Portuguese, Dutch to Portuguese, and 8 more.
multi-grade classes
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Brazil
Try it out in Translation and Content...
Native in: Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Portuguese to English
multi-grade classrooms ou multi-level classrooms
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Portugal
Business Language Solutions Pt>Eng
Native in: English
Works in: Portuguese to English, English to Portuguese
mixed-grade classes
https://theconversation.com/are-mixed-grade-classes-any-better-or-worse-for-learning-38856
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Brazil
Translating is my passion!
Native in: Portuguese (Variant: Brazilian)
Works in: Portuguese, English, Portuguese to English, and 1 more.
Multi-level classes
United Kingdom
Education and neurodiversity specialist
Native in: English
Works in: Spanish to English, French to English, Portuguese to English
mixed ability classes
In nearly all British state junior schools, children learn in mixed ability classes.
My children are mixing with a diverse group of mixed-ability children from all walks of life.
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