Home Study Tips Helpful Mnemonics Cheat Sheet To Make Memorising For O-Ranges Simpler For You

Helpful Mnemonics Cheat Sheet To Make Memorising For O-Ranges Simpler For You

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O-Ranges require plenty of reminiscence work, which might be one of many hardest and most time-consuming challenges that you simply face whenever you’re learning to your exams. Even in case you have mastered the talents and strategies, you may’t apply them in your examination in the event you can’t memorise what it’s worthwhile to.

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Utilizing mnemonics is a hack that’s usually adopted by college students from all world wide. You make memorisation simpler by forming tales or rhymes which you could affiliate with what it’s worthwhile to keep in mind. It should show you how to to make sure that the data it’s worthwhile to memorise shall be effortlessly caught in your head.

I’ve compiled a fast cheat sheet of mnemonics for the completely different O-Stage topics which might be going to be helpful for you.

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You may already know a few of them, or you may uncover new ones which might be going to ease your burden throughout your revision.


For English, spelling generally is a battle for a lot of, particularly the generally misspelled phrases. It’s further difficult for phrases with the identical sounds however is spelled in a different way.

However I’ve obtained simply the hack so that you can differentiate the spelling for some phrases which might be usually complicated for college students.

‘ie’ or ‘ei’?

Loads of college students have difficulties differentiating whether or not the phrase ought to be spelled with an ‘ie’ or ‘ei’ once they each sound the identical.

Examples of some phrases which might be spelled with:


  • Consider
  • Perception
  • Thief
  • Obtain
  • Chief
  • Piece
  • Yield


  • Obtain
  • Deceive
  • Receipt
  • Ceiling
  • Conceit
  • Understand

When unsure, at all times keep in mind the rule of thumb: “I earlier than E, besides after C”. Do you see it?

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Repeat this mnemonic everytime you’re spelling these phrases and you’ll by no means combine them up once more.

‘Principal’ or ‘precept’?

These two phrases sound the identical however have completely completely different meanings; one is your faculty principal, whereas the opposite is a perception or rule.

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When unsure, do not forget that: “A principal is at all times a buddy.”

Since a pal is a buddy, do not forget that ‘principal’ refers back to the individual: your faculty principal.

Spelling ‘Obligatory’

One ‘C’, two ‘S’s? One ‘S’, two ‘C’s? Spelling ‘mandatory’ can nonetheless be very complicated for a lot of.

Simply keep in mind the outfit: “One Collar and Two Socks”. One ‘c’ and two ‘s’s!

Spelling ‘Exaggerate’

You may nonetheless be spelling ‘exaggerate’ with just one ’G’. 

Keep in mind: “Goofy Greg beloved to magnify”. Spell ‘exaggerate’ with two ‘G’s!

Credit: Oxford Royale

Extra Arithmetic

Sum and Product of Roots

Other than needing to grasp the ideas, Extra Arithmetic additionally requires you to memorise plenty of formulation that you’ll want to make use of to resolve your issues, they usually can turn into complicated.

One set of formulation that it’s worthwhile to memorise is the sum and product roots. This set of formulation will not be offered within the given components sheet.

So what’s a straightforward option to keep in mind how one can resolve for the sum and product of roots? Simba and Pica!

Simba: Sum of roots Is Minus B over A

Pica: Product of roots Is C over A

Credit score: Apex Math Tuition Singapore

Consider these two cute characters and also you gained’t mess up the formulation anymore!

Elementary Arithmetic

Order of Operations

Photograph credit score: Miss Quinn Teaches

Relating to fixing a protracted, sophisticated math downside with many operations, you completely must know which operation to start out with.

When you resolve within the flawed order of operations, you’ll get a totally completely different reply.

The order of operations is likely one of the fundamentals that it’s worthwhile to get proper, or it would price you to lose pointless marks in lots of questions.

So, you may simply memorise the order of operations by remembering “BODMAS”:

  • Brackets
  • Orders (Powers/Indices/Roots)
  • Division
  • Multiplication
  • Addition
  • Subtraction

Trigonometric Ratios

Trigonometric ratios are used lots in O-Stage Elementary Arithmetic the place it’s worthwhile to keep in mind find out how to resolve for the lengths and angles in a triangle.

There are three lengths in a triangle:

  • Hypotenuse (the longest facet of the triangle)
  • Adjoining (the size adjoining/subsequent to the recognized angle, however not the hypotenuse)
  • Reverse (the size reverse the recognized angle)

Three trigonometric features that can be utilized:

  • Sine (Sin)
  • Cosine (Cos)
  • Tangent (Tan)

These are sometimes used interchangeably, so how will you keep in mind find out how to use them respectively? By remembering “TOA CAH SOH” (Large-Footed Girl in Hokkien):

Tangent angle = Opposite size over Adjacent size

Cosine angle = Adjacent size over Hypotenuse

Sine angle = Opposite size over Hypotenuse

This catchy phrase that’s very Singaporean will show you how to to match the trigonometric ratios with no issue.


The 4 Most Generally Used Alkanes

Alkanes are a sequence of saturated hydrocarbons (carbon and hydrogen). It’s a enormous element in chemistry that you’ll want to determine in your papers.

In O-Ranges, they’ll normally solely require you to memorise the primary 4, that are methane, ethane, propane, and butane.

There’s a very simple means so that you can keep in mind the order of those alkanes:

  • Methane (Megan)
  • Ethane (Eats)
  • Propane (Peanut)
  • Butane (Butter)

Reactivity Sequence of Metals

The reactivity sequence is one other important checklist that it’s worthwhile to memorise, as chemistry is lots about reactions.

Totally different metals within the periodic desk have completely different reactivities and are positioned in an order.

You’ll need to know which of the metals will react first and so forth., because the questions will certainly check you on these.

You need to use this straightforward sentence:

  • Potassium (Please)
  • Sodium (Cease)
  • Calcium (Calling)
  • Magnesium (Me)
  • Aluminium (A)
  • Zinc (Zebra)
  • Iron (As a substitute)
  • Tin (Inform)
  • Lead (Laura)
  • Hydrogen (How)
  • Copper (Copper)
  • Silver (Strengthens)
  • Gold (Gold)

Credit score: SimpleChemConcepts


Photograph Credit score: Biology On-line

Carbohydrates are natural compounds that may normally be damaged all the way down to launch vitality within the physique.

There are various kinds of carbohydrates: easy carbohydrates which have monosaccharides (easiest carbohydrates) and dissacharides (double sugars). There are additionally advanced carbohydrates that are lengthy chains of sugar molecules strung collectively.

You’ll need to know some examples of every of the varieties of carbohydrates, and that is how one can memorise them:

Easy Carbohydrates: Monosaccharides

  • Glucose (Good)
  • Galactose (Woman)
  • Fructose (Pal)

Easy Carbohydrates: Disaccharides

  • Maltose (My)
  • Lactose (Lazy)
  • Sucrose (Son)

Complicated Carbohydrates

  • Starch (So)
  • Glycogen (Good)


Electromagnetic waves

Based on The Financial Occasions, electromagnetic waves “are created on account of vibrations between an electrical area and a magnetic area.”

These are the varieties of electromagnetic waves which might be organized from Lengthy Wavelength, Low Frequency, Brief Wavelength, Excessive Frequency.

  • Radio waves (Ruby’s)
  • Microwaves (Mom)
  • Infrared waves (Is)
  • Seen waves (Visiting)
  • Ultraviolet waves (Uncle)
  • X-ray (Xavier’s)
  • Gamma-ray (Backyard)

Relationship between Focal Size and Object & Picture distance, from a lens or mirror

To calculate the focal size, distance of object, or distance of picture, the components used is:

1/f = 1/do + 1/di

To recollect this components effortlessly, keep in mind “If I do, I die”, the place:

  • “f” = Focal size
  • “do” = Distance of Object
  • “di” = Distance of Picture

Credit score: Mnemonic System


The Seven Continents

One of many topic for Mixed Humanities is Geography. Figuring out what the continents are is essential! Don’t mistake continents for nations or states.

Right here’s how:

  • Europe (Eat)
  • Asia (An)
  • Africa (Apple)
  • Australia (As)
  • Antarctica (A)
  • North America (Nighttime)
  • South America (Snack)

Credit score: Seterra


Loads of topics within the O-Ranges are content-heavy and require reminiscence work to do effectively. It’s dangerous in the event you hope that your mind will magically keep in mind what it’s worthwhile to keep in mind whenever you attempt to examine simply by studying it again and again. 

I hope that the mnemonics that I’ve shared can be helpful for these taking the O-Ranges!

Do you’ve every other attention-grabbing ways in which you used to memorise content material? Share with us within the feedback under!

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