The spread is the difference between the bid price and the ask price. A bid is a buy order, where you sell the base currency, and an ask is a sell order, where you buy the base currency. Base currency is the first currency in the pair.
FBS broker offers competitive spreads for exotic Forex. To make sure, you can check USDZAR, USDMXN, and USDTRY and have a look at the spreads. You can choose your exotic Forex pairs and start trading with FBS.