IB Chemistry Reactivity 1 explained for SL and HL: the thermodynamic and kinetic drivers, the Gibbs free energy threshold, and the question types that decide your 6 or 7.
IB Chemistry Structure 2 question types, mark boundaries, and preparation strategy for ionic, covalent, and metallic bonding models in the IB Diploma exam.
IB Chemistry Structure 1 explained: how models of the particulate nature of matter drive Paper 1 marks, with preparation strategy for SL and HL candidates.
IB ESS Paper 2 mark scheme grid, calculation rows, and the quantitative step marks that lift a level 5 response to a level 6 in IB Diploma ESS preparation.
How IB ESS candidates can read Paper 1 Section A stimuli with the precision the rubric demands, and lift marks above the Level 5 ceiling without memorising more case studies.
Why IB ESS Paper 1 Section A and Section B reward the same content differently, and how to read the rubric so your preparation pipeline stops leaking marks.
IB ESS Paper 1 Section A looks forgiving, yet the first four questions quietly cap your mark if you treat them as recall. Here is the framework that converts easy marks into a 7.
IB ESS Paper 1 Section A source-based question triage: minute budgets, archetype spotting, and the reading discipline that lifts candidates from Level 5 to Level 7.
The five unifying themes are not syllabus headings — they are the assessment architecture behind every IB ESS question. Understanding how they construct the rubric changes your preparation strategy…