I assume this "puzzle" wants you to keep all the digits in the initial order and insert an "operations sign" (add, subtract, multiply or divide) somewhere to get the answer 195.
I look for a number that gets me really close without an "operations sign" . . .
That's 136
With 59 remaining, if I place + between the 6 and 5, I get the sum 195
136 + 59 = 195