Is this circuit calculation correct
The voltage at V1 = 8kOhm / (8kOhm + 16kOhm) * 15V = 5V .
You have the right idea with current, however, it is flowing in the opposite direction as you have shown in the 10kOhm resistor.
For the 8/16kOhm resistors, the current is :
15V / (8kOhm + 16kOhm)= 0.625A
The total current is therefore:
I = 1.5mA + 0.625A