As you see in the graph below, there are $10$ empty circles in our star and you are asked to fill these circles with the numbers between $1$ to $12$ (you can choose which two numbers you will not use among these) in them:
But while putting these values inside the circles, you need to consider the special property of this star:
The five sums along the dash lines (such as $C+G+F+E$) and the sum around the pentagon inside the star ($H+I+J+F+G$) are all equal to each other.
This star is called the perfect star.
FYI: Forgot to put dash line through B to D and very tired to draw this again. so assume there is dash line over there too.