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Edexcel International GCSE Biology Course Overview

Revision notes organised by course overview, topic-area hubs, topic pages, practical reference pages and cross-topic syntheses.

Scope

  • Qualification: Pearson Edexcel International GCSE in Biology
  • Qualification code: 4BI1
  • This overview covers the full course, including Topics 1 to 5, the bold B content, mathematical expectations and suggested practical investigations

Assessment Shape

The course is examined through two written papers taken across the full five-topic course. The longer paper covers the shared route that all students study. The shorter paper can also test the extra Biology-only depth statements marked in the specification. Because both papers may draw from any topic area, it is better to revise Topics 1 to 5 as one connected course than as isolated paper-only blocks.

For reference, Paper 1 (4BI1/1B) lasts 2 hours, carries 110 marks and accounts for 61.1% of the qualification, while Paper 2 (4BI1/2B) lasts 1 hour 15 minutes, carries 70 marks and accounts for 38.9%. Across the two papers, question styles include multiple choice, short-answer items, calculations and extended responses. Experimental skills are assessed through written examinations rather than through a separate practical paper.

Route Labels

  • All students means the content is required for both Biology-only and Combined Science students.
  • **Biology-only** means the content is required for Biology-only students and is not required for Combined Science students.
  • All students + **Biology-only** detail means the page summary includes core content plus an extra Biology-only element.

Topic Map

Further Detail