I want to know how to find the next pattern

I want to know how to find the next pattern

In question 5.
In first diagram I am treating place with digit 5 as 1st quadrant.
Place with 9 as 2nd quadrant.
Place with H as 3rd quadrant.
And place with E as 4th quadrant.
There is 2 numbers and 2 letters in each diagram.
Each element in circle rotated anti-clockwise. And element in 2nd quadrant eliminated. And new element placed in 4 quadrant.
Using this logic we have 7 in 1st quadrant, 3 in 2nd quadrant, L in 3rd quadrant. And one new element placed in 4th quadrant. Only D satisfies all conditions. So answer is D.
Any doubt please ask.