Paul Burns I have checked a number of times with transferwise, and taking into considering their high fees, my general bank transfer to SCB was better every time, even with the slightly better exchange rate with TW. I think people don't properly check other avenues before using transferwise. I am yet to use them unless I get more at the other end.
You are Indian by the looks of it, so you are getting a visa on arrival (VOA) you are not getting a Single Entry Tourist (SETV) So get a VOA, and then If you will come back to Bangkok on the 7th, and leave before the 15th, then get a re-entry permit. Arrival 2 to 3 hours before all international flights is recommended. If you want to stay past the 15th, then skip the Re-entry, go to Cambodia and then get another VOA when you come back.