Here are some resources that might be helpful for "assimilation" and "perfectionnement" in English, in PDF format, and for free:
On , eBay , or Vinted , people sell used Assimil books for as little as €5. They often include the original CDs. assimil+perfectionnement+anglais+pdf+free
This course is designed for learners who already have a solid base in English (B2 level) and want to progress to advanced fluency (C1 level). Target Audience Here are some resources that might be helpful
The "free PDF" versions online are frequently missing the crucial audio files, which are 50% of the value. in PDF format