is clil working? is the bilingual class effective? are students learning through english?

CLIL has been around for some time now: 

Content and language integrated learning (CLIL)[1][2] is an approach for learning content through an additional language (foreign or second), thus teaching both the subject and the language.

Content and language integrated learning - Wikipedia

Jay Doubleyou: clil: content and language integrated learning

And is getting more and more widespread:

Jay Doubleyou: the spread of clil

Here's a useful introduction:

CLIL: A lesson framework | TeachingEnglish | British Council

And there are a lot of materials to support teachers:

Content and Language Integrated Learning | TeachingEnglish | British Council

Lesson Share: How should CLIL work in practice? | Article | Onestopenglish

Working CLIL - Bringing together practitioners, researchers and teachers

(PDF) CLIL: Some of the reasons why … and why not

After some years of practice, there is now some reflection happening:

Critical Analysis of CLIL: Taking Stock and Looking Forward | Applied Linguistics | Oxford Academic (from 2014)

Revisiting CLIL: Background, Pedagogy, and Theoretical Underpinnings (from 2020)

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We can also call it 'bilingual teaching':

In bilingual education, students are taught in two (or more) languages.[1] It is distinct from learning a second language as a subject because both languages are used for instruction in different content areas like math, science, and history. The time spent in each language depends on the model. For example, some models focus on providing education in both languages throughout a student's entire education while others gradually transition to education in only one language.[2] The ultimate goal of bilingual education is fluency and literacy in both languages through a variety of strategies such as translanguaging and recasting.[3]

Bilingual education - Wikipedia

Jay Doubleyou: bilingual teaching today

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And then there is 'English medium instruction':

An English-medium education system is one that uses English as the primary medium of instruction—particularly where English is not the mother tongue of the students. Known as English-Medium Instruction[5] (EMI), or ICLHE (Integrating Content and Language in Higher Education),[6] this rapidly growing phenomenon has been contested in many contexts.[7]

English-medium education - Wikipedia

Here's a little more:

Frontiers | In English Medium Instruction you can walk and chew gum

How effective is English as a medium of instruction (EMI)? | British Council

And here's a critique:

English medium instruction may have negative learning outcomes for students - E L Gazette

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What's the difference?

CLIL and EMI - From Schools to Higher Education | TeachingEnglish | British Council

English Medium Instruction vs Content Language Integrated Learning: Why is the distinction important? – annamend

And:

Education in two languages: bilingualism and CLILELT Learning Journeys

And:

Bilingual Education, CLIL and EMI - University of Chichester

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