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The ion with the smallest m/z reaches the detector first 👀

Then it’s just:
find the missing abundance → calculate Ar using the table

Most students make this harder than it actually is because they panic at all the numbers

Comment “MASS SPEC” if you want more A-level Chemistry walkthroughs

Mass spectrometry questions look scary… but most of the marks come from knowing which equation to use

Potential difference transfers energy
And that energy becomes kinetic energy

Link those two ideas together and the question becomes much simpler

Comment “PHYSICS” if you want more A-level Physics walkthroughs

Inequalities questions become much easier once you stop guessing which side of the line to shade

Turn each equation into y = mx + c first
Then think:
above the line or below the line?

Most students lose marks because they rush the inequality signs

Comment “INEQUALITIES” if you want more GCSE Maths walkthroughs

Most students see fractions in equations and panic immediately

But these questions are usually just about staying organised step by step

Expand carefully
Simplify properly
Then solve

Rush it and the mistakes start piling up

Comment “EQUATIONS” if you want more GCSE Maths walkthroughs

This integral looks horrible at first glance… but the substitution makes everything fall into place

Most students struggle because they try to integrate it immediately instead of simplifying the structure first

Once you choose the right substitution, the question becomes much more manageable

Comment “INTEGRATION” if you want more A-level Maths walkthroughs

These chemistry calculations become much easier once you follow the same method every time

Find the moles
Use the ratio in the equation
Then work out the mass

Most students lose marks because they don’t know what step comes next

Comment “MOLES” if you want more GCSE Chemistry walkthroughs

Integration by substitution looks impossible at first… until you know what the substitution is actually doing

Most students can follow the steps
Very few actually understand why they work

Once the structure clicks, these questions become much more manageable

Comment “INTEGRATION” if you want more A-level Maths walkthroughs

Most students lose marks on these because they panic when they see the equation

But once you know the method:
moles → ratio → mass

…the whole question becomes much easier

The hardest part is usually knowing where to start

Comment “MOLES” if you want more GCSE Chemistry walkthroughs

Implicit differentiation questions become much easier when you differentiate carefully step by step.

Watch out for:
• chain rule errors
• trig derivatives
• rearranging cleanly at the end

A very common A-Level exam skill.