1) you can let your kid repeat k3. 1 year delay is a lot. He will not get good marks in school, ie. will not get into a good secondary school in future. My son is 6-month delay. I let him repeat k2. Don't risk his future, especially a boy, speech not as good as girls in the same school already even if normal
2)you can choose not to fill in section 6. Then tell the school after your enrol. Help will be delayed only for 1 term. Subsidy will start in Spring term in March. I just called them this morning.
3) small class is better than big and traditional teaching method is not good as teachers scold students who cannot perform well. Choose a school with understanding teachers.