To calculate the number of students in this year's 6th grade class after a decrease of 36%, we start with the original number of students:
\[ \text{Original number of students} = 350 \]
Next, we determine the amount of the decrease:
\[ \text{Decrease} = 350 \times 0.36 = 126 \]
Now, we subtract the decrease from the original number of students to find the current total:
\[ \text{Number of students this year} = 350 - 126 = 224 \]
Therefore, the number of students in this year’s 6th grade class is:
\[ \boxed{224} \]