Could you erudite ESL thinktank in this forum help answer the enquiries down below?

1. What is a 4-year bachelor degree equivalent to in terms of classroom hours?

2. What is the difference between a diploma and a post graduate diploma?

3. Why do some schools refer to a diploma as a post graduate diploma?

4. What is a 180-hour course equivalent to in terms of years of study?

5. How do schools in western countries verify certificates?

Any inputs will highly appreciated.

Regards