Grammatical Range & Accuracy is evaluated based on two main criteria: the diversity of grammatical structures used and the correctness of their application. To score well, you need to demonstrate a variety of sentence structures, including complex sentences, conditional clauses, and passive voice. Using a range of grammatical forms shows that you can handle different types of information and convey it accurately. Conversely, errors in grammar can affect clarity and coherence, potentially lowering your score. Therefore, mastering a range of structures and avoiding common grammatical mistakes are essential for achieving a high band score in Task 1.