An illustrative GCSE History (AQA) 16-mark answer — marked and improved by Teach Edge, with teacher control.
You're close to the top band because your argument is clear. To push higher, add a couple of precise facts and tighten the "because" links so you're explaining causes, not just describing events.
"The alliance system mattered most because it turned the Sarajevo crisis into a wider European war. After Franz Ferdinand was assassinated, Austria-Hungary felt confident to act harshly against Serbia because Germany offered the 'blank cheque'. Russia then began mobilisation to defend Serbia, which pushed Germany to mobilise and declare war on Russia and France. As countries followed their alliance commitments, a local Balkan crisis escalated into a general war."
A fast check — and optional tweaks — before you release to students.
Skim
Check the mark and scan the feedback for accuracy.
Optional tweak
Add a class phrase or adjust one target.
Adjust mark
Only if needed (rare).
Release
Send to students (or auto-release if you choose).
Often you'll release the draft as-is — edits are optional.