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This 41-page Edexcel IAL Biology Unit 6 (WBI16/01) Master Revision Guide covers the A2 practical skills paper – the counterpart to Unit 3 but with added statistical analysis. Aligned with the 2019–2025 exam series and based on Principal Examiner Reports (2020–2024), this resource includes the fixed 4-question structure that repeats every sitting – so you know exactly what to prepare.

What’s inside?

Fixed paper format – Q1 (method based on a CP), Q2 (novel data context), Q3 (statistics on a familiar CP), Q4 (full investigation planning). Learn the pattern.

Top 15 penalised errors – Direct from examiner reports.

Statistical tests – t-test, chi-squared (χ²), Spearman’s rank, Pearson’s correlation. Decision flowchart, null hypothesis writing (difference vs correlation), full procedure, and the conclusion sentence template (calculated value, critical value, p=0.05, df, reject/accept null).

9 A2 core practicals (CP10–CP18)

Q4 full investigation framework – Q4a (preliminary work: specific + what information it gives), Q4b (7-element method: IV range, DV measurement, ≥3 CVs with control methods, replication, control), Q4c (table + graph type + statistical test), Q4d (3 specific limitations with justifications).

Graph rules for A2 – Two-line graphs with key, error bars (SD), scatter graphs with line of best fit (not forced through origin unless data supports), y-axis label complete with units.

Model answers – Statistical conclusion (full template), preliminary work (2-mark), improvement with justification (2-mark).

How I use this resource:

For teachers – Use diagnostic activities (Section 14.1) to identify weakness profiles: CV control method gaps, vague preliminary work, improvements without justification. The Unit 3 vs Unit 6 comparison table (14.2) helps transition students.

Independently produced by Samata Reviews. Not affiliated with or endorsed by Pearson Education Limited.

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