塾

1. Origins, structure, and basic meaning

• Structure: 塾 (じゅく) is a single-character noun for a private academy or cram school.
• Basic usage: Students attend it after regular school and may take extra lessons before an exam.

2. Common pitfalls and similar expressions

• Supplementary study outside regular school
  • 塾 typically adds subject instruction or exam preparation and is distinct from the student's main school.