• Polish - W roku 1923 sześć klas szkoły powszechnej Białystok
• English - In 1923 6 grades of elementary school in Białystok. So not even a mention of an apprenticeship. But he probably didn't lie, I'm sure it was enough to be a helper. But the helper part just got dropped later .

• • Polish - Welded wlasnego zen Anita
  • English - Electricians Helper

You will see a lot of this in these documents:
it's short for według własnego zeznania - according to his own testimony. They used this because of course nobody had any documentation to prove anything, so to make it clear that these were self-acknowledged accomplishments, certifications, they wrote that as a caveat. It's on my father's also.