It is not mandatory to by-heart all the listed vocabulary. In normal cases, we are using some basic level of vocabulary in writing and speaking. But in certain cases to improvise and flourish the writings and speech in more perpetual way it is better to know some tough words too to express the meaning inappropriate to the context. There are around 250 words listed and its meaning is nearby. These premium words are fair enough to score maximum. The way most people build their vocabulary is by reading words in context. Reading is ultimately the best way to increase your vocabulary, although it also takes the most time.

NB: - If you try to study some of these words you may unconsciously study some other appropriate words during your practice and it would be applicable in the examination. That would be enough to score your required score.

A

• Abate: To become less strong or decrease
• Aberrant: Not usual or normal
• Abeyance: Something such as a custom, rule, or system that is in abeyance is not being used at present
• Abscond: To suddenly leave the place where you are being kept for doing something wrong
• Abstemious: Formal or humorous careful not to have too much food, drink, etc
• Admonish: To tell or warn someone severely that they have done something wrong
• Aggregate: The total after a lot of different parts or data
• Alacrity: Quickness and eagerness
• Alleviate: To make something less painful or difficult
• Ambivalence: Not sure whether you want or like something or not
• Ameliorate: To make something better
• Anachronism: Someone or something that seems to belong to the past
• Analogous: Similar to another situation or thing so that a comparison can be made 
• Anomalous: Different from what you expected to find
• Antipathy: Strong dislike or opposition towards someone or something
• Apathy: The feeling of not being interested or not caring
• Appease: To make someone less angry or stop them from attacking you by giving them what they want
• Apprise: To inform or tell someone about something
• Approbation: Official praise or approval
• Arduous: Involving a lot of strength and effort
• Artless: Natural, honest, sincere
• Ascetic: Living without any physical pleasures or comforts
• Assiduous: Very careful to make them responsible is done properly or completely
• Assuage: To make an unpleasant feeling less painful or severe
• Attenuate: To make something weaker or have less effect
• Audacious: Brave and shocking
• Austere: Plain and simple and without any decoration
• Aver: To say something firmly and strongly because you are sure that it is true 

B

• Banal: Ordinary and not interesting, because of a lack of new or different ideas
• Belie: To give someone a false idea about something
• Bolster: To help someone to feel better and more positive
• Bombastic: Long important sounding words that have no real meaning
• Boorish: Behaves in a very rude way
• Burgeon: To grow or develop quickly
• Burnish: To polish metal until it shines
• Buttress: To support a system, idea, or argument, especially by providing money

C

• Cacophonous: A loud unpleasant mixture of sounds
• Capricious: Changing quickly and suddenly
• Castigation: To criticize or punish someone severely
• Caustic: Criticize someone in a way that is unkind but often cleverly humorous
• Chicanery: The use of clever plans or actions to deceive people
• Coda: A separate piece of writing at the end of a work of literature or a speech
• Cogent: Reasonable & correct argument
• Commensurate: Matching something in size, quality, or length of time
• Compendium: A collection of different and complete items in a box or book
• Conciliatory: Doing something that is intended to make someone stop arguing with you
• Condone: To accept or forgive behavior that most people think is morally wrong
• Confound: To confuse or surprise people by being unexpected
• Connoisseur: Someone who knows a lot about art, music, food, etc 
• Contention: An opinion that someone expresses
• Contentious: Someone who is contentious and often argues with people
• Contrite: Feeling guilty and sorry for something bad that you have done
• Conundrum: A confusing & difficult problem
• Converge: To come from different directions and meet at the same point
• Convoluted: Complicated and difficult to understand
• Craven: Completely lacking courage

D

• Daunt: To make someone feel afraid or less confident
• Decorum: Correct behavior that shows respect
• Deference: Behavior that shows that you respect someone and are therefore willing to accept their opinions or judgment
• Delineate: To describe or draw something carefully so that people can understand it
• Denigrate: To say that something or someone is not good or important
• Deride: To make remarks or jokes that show you think someone or something is silly or useless
• Derivative: Something that has developed or been produced from something else
• Desiccate: To remove all water from something
• Desultory: Done without any particular plan or purpose
• Deterrent: Something that makes someone less likely to do something
• Diatribe: A long speech or piece of writing that criticizes someone or something very seriously
• Dichotomy: A separation between two things or ideas that are completely opposite
• Diffidence: Shy and unwilling to make people notice you or talk about you
• Diffuse: To make heat, a gas, etc spread so that it mixes with the surrounding air or water
• Digression: To move away from the main sub-subject that you are talking or writing about
• Dirge: A slow and sad song sung at a funeral
• Disabuse: To persuade someone that what they believe is untrue
• Discerning: Showing the ability to make good judgments, especially about art, music, style, etc
• Discordant: To seem strange and unsuitable in relation to everything around
• Discredit: Loss of other people’s respect of trust
• Discrepancy: A difference between two amounts, details, reports, etc that ought to be the same
• Discrete: Separate
• Disingenuous: Not sincere and slightly dishonest
• Disinterested: Able to judge a situation fairly because you are not concerned with gaining any personal advantage from it
• Disjointed: Not well connected 
• Disparage: To criticize someone or something in a way any connection with someone or something
• Disparate: Very different and not connected with each other
• Dissemble: Hiding your true feeling, idea, or desire
• Disseminate: To spread information, ideas, etc to as many people as possible, especially in order to influence them
• Dissolution: The process by which something gradually becomes weaker and disappears
• Dissonance: Combination of non-harmonic musical notes
• Distend: Pressure from inside causing swelling or moving something
• Divest: To take off something you are wearing or carrying 

E

• Ebullient: Very happy and excited
• Efficacy: The quality of being able to produce the result that was intended
• Effrontery: Behavior that you think someone should be ashamed of
• Elegy: A poem or song written to show sadness for someone or something that no longer exists
• Elicit: To succeed in getting information
• Embellish: To make a story or statement more interesting by adding details that are not true
• Empirical: Based on scientific testing and practical experience not on ideas from books
• Emulate: Try to be like someone else because you admire them
• Endemic: Always present in a particular place
• Enervate: Having lost energy and feeling weak
• Engender: To be caused of a situation or feeling
• Ephemeral: Popular or important for only a short time
• Equanimity: Calmness
• Equivocate: To say something that has more than one possible meaning
• Erudite: Showing a lot of knowledge based on careful study
• Esoteric: Known only by a few 
• Eulogy: Praising somebody or something very much
• Euphemism: A polite word or expression to talk about shocking news without hurting the person
• Exacerbate: To make a bad situation worse
• Exculpate: To prove that someone is not guilty of something
• Exigency: Something that you must do to deal with an urgent situation
• Extrapolation: To make a guess about something in the future from facts that you already know