In secondary school English stops being loose vocabulary and becomes grammar you have to choose: past simple or present perfect? active or passive? because or although? Typical mistakes are not about not knowing the rule but about applying it in the wrong place, and that only improves by seeing lots of different sentences.
La Pieza que Falta mixes all those topics into sentences to complete against the clock, which is how they appear in exams; Ordena la Frase works on structure (where the adverb goes, how a question is formed) and the English mode of Corrige el Texto forces careful reading. Each topic also has its own ten-question exam with explanations.
With a summary, examples and a multiple-choice test.
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