In a row of $22$ boys, when Prakash was shifted by two places towards the left, he became $8\text{th}$ from the left end. What was his earlier position from the right end of the row?

Total number of boys in the row = $22$.
After shifting two places to the left, Prakash's new position is $8\text{th}$ from the left end.
Therefore, his earlier position from the left end was:

$$\text{Earlier Position from Left}=8+2=10\text{th}$$

Now, we need to find his earlier position from the right end using the ranking formula:

$$\text{Total}=\text{Position from Left}+\text{Position from Right}-1$$

$$22=10+\text{Position from Right}-1$$

$$22=9+\text{Position from Right}$$

$$\text{Position from Right}=22-9=13\text{th}$$

Thus, his earlier position from the right end was $13\text{th}$.