Feif Un once posted a story about his brother, who wanted to sit and learn, and asked R’ Chaim Segal zt”l (from Chaim Berlin) if he could stop attending secular studies (this was in 11th grade). R’ Segal refused to allow it.
My younger brother also attended Chaim Berlin, although R’ Segal was no longer alive. He also asked about stopping secular studies, and R’ Braunstein refused to allow him to drop out. He told him that he needed a high school diploma.