Just to re-iterate what´s been said before, most of the tests are not of the type that you can train for. The exception IMO are the ones where you listen to english texts and are asked about content, replace specific words and remember numbers. The qualities that are tested here are not trainable per se, but if you have a hard time with the english language, well... So my recommendation is to read and above all, listen to english. Obviously this advice is mostly valid for non-english speakers.