People's IQ is generally expressed by IQ, and the grades are as follows:

1, genius: 140 or more

2. Excellent: 120- 129

3. Extraordinary: 130- 139

3. High school and intelligence:110-119.

4. Medium: 90- 109

5. Middle and lower layers: 80-89

6. Critical mental deficiency: 70-79

7. Mental retardation: below 70.

Iq calculation formula: IQ =MA (psychological age) ÷CA (actual age) × 100.

IQ consists of observation, attention, memory, thinking and imagination.