📚 High-Frequency Exam Topics and Common Mistakes Analysis for Year 11 AQA Computer Science | Year 11 AQA 计算机：高频考点与易错题分析
In the AQA GCSE Computer Science (8525) exam, certain topics appear consistently and often trap students with subtle details. This article highlights the most frequently assessed content areas and the common mistakes made by Year 11 learners, providing clear explanations and strategies to avoid losing marks.
在AQA GCSE计算机科学(8525)考试中，某些主题反复出现，并经常因细节而让学生失分。本文重点介绍常考内容和Year 11学生的常见错误，提供清晰的解释和避免失分的策略。
1. Binary Arithmetic and Overflow | 二进制运算与溢出
Binary addition follows simple rules: 0+0=0, 0+1=1, 1+0=1, 1+1=0 carry 1. When adding two binary numbers, align them and add column by column. Example: 0110₂ (6) + 0101₂ (5) = 1011₂ (11). Students often treat binary digits as decimal and carry incorrectly, or forget to write the carry bit above the next column.
二进制加法遵循简单规则：0+0=0, 0+1=1, 1+0=1, 1+1=0且进位1。将两个二进制数对齐，逐列相加。例如：0110₂ (6) + 0101₂ (5) = 1011₂ (11)。学生经常将二进制位当作十进制处理，进位错误，或忘记在下一
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