Since "GDZ" specifically refers to pre-solved answers, you are likely looking for the or Workbook with Key for your specific edition (e.g., 4th or 5th edition).
: These versions include an "Answer Key" section at the back specifically for self-study.
For the most accurate material, including interactive exercises and audio, use the Headway Student's Site. You can select your level (Beginner to Advanced) to find: gdz po anglijskomu new headway
Which do you have (the color of the cover usually helps)? Headway Student's Site | Learning Resources
: For Beginner levels, you can find full episodes and transcripts on YouTube that cover the textbook's video units. Since "GDZ" specifically refers to pre-solved answers, you
: Useful for completing listening and comprehension tasks.
Searching for (готовые домашние задания / solved homework) for the New Headway English series typically leads to resources provided by Oxford University Press or educational sites that host answer keys (Teacher's Books) for various levels. Official Learning Resources You can select your level (Beginner to Advanced)
: Interactive activities to check your grammar and vocabulary. Finding Answer Keys