What city is the World school in?
I know some schools with this name that are OK, although the work is pretty hard.
Others...don't know anything about them.

In general, the advice to avoid the chain/franchise schools is quite good...with EF overall near the bottom of the barrel.
A lot of these chains claim American or European or Canadian or Australian or other "trustworthy" ownership. In reality the foreigners are generally just franchisors, who have little knowledge or authority regarding the individual franchise schools. When push comes to shove, any foreign teacher who relies on the foreign franchisor for protection or assistance, will be in for a very rude awakening.