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Verbal:
Concepts
SC: Manhattan Sentence Correction Guide
CR: Either Manhattan Critical Reasoning Guide or Powerscore CR Bible
RC: No good book per se. A document titled Gins RC helped me improve my score in this section. So probably a good bet to read this.
Practice
Official Guide
Official Guide Verbal
Quant:
Concepts
Manhattan - Set of 5 books (Even if you already know the concepts, it doesnt hurt to go through this set of 5 books. There may be tiny bits of information which you didnt know earlier)
Practice
Official Guide
Official Guide Quant
Additional:
The above mentioned books are the bare minimum you need to get a good score. Additionally, you may refer to any of these books for additional practice:
Kaplan 800 - Material only for those who are already at the 700 level
Kaplan Quant - Lot of questions
Veritas Books - Concepts + Good questions
Aristotle SC - Good revision of SC concepts
According to me, this should be sufficient. Of course, apart from this, mocks will be your best bet for additional practice.

If you are also one of the few people who are aiming to join institutes in order to learn foreign languages, here are the top 10 institutes in India which would help you fulfill this dream of yours. Jawaharlal Nehru University
The largest university in India Jawaharlal Nehru University offers a variety of courses for the students to enroll in. There is hardly any other university like JNU which offers such great choice of languages when it comes to learning a foreign language. Here you can learn languages such as Spanish, French, Russian, and Chinese. Not only can you learn foreign languages but you can also pursue a higher postgraduate and or doctorate in any language of your choice which would offer you a great job opportunity. The vibrant campus combined with happening life is an added benefit to this package.
2. Delhi University
The list of most popular universities in India is definitely topped by Delhi University. This university which is an absolute favorite of secondary school pass outs offers students a chance to learn foreign languages and pursue a Bachelors or Masters in the field. You can learn a variety of popular languages such as French, German, and Spanish while some not so common ones like Polish and Serbian are also taught in its colleges
3. EFLU Hyderabad
Ranking third on this list is the English and Foreign Language University headquartered in Hyderabad. This university is one of the few institutions which have been exclusively set up in order to help students learn foreign languages in the nation. The university is renowned for offering an undergraduate and post-graduate degree in various foreign languages. Some of the languages it offers include Japanese, Russian, Persian, Turkish and Korean which offers learners career options such as working as certified translators or offering voice-over services to numerous MNCs and companies.

Hello Aadil,
Diploma in Aeronautical Engineering will fetch you certain types of jobs. It can lead you to obtain degree also and then you would be in a different sphere. AME is a totally different type of education. During this course, you are taught about the different aspects of maintenance of civilian aircraft. Also invariably, the institute enables you to obtain a licence from DGCA which is a must.
Presently in India, almost all aviation companies have announced plans to expand their fleet. This, in turn, is bound to increase opportunities of employment in this sector and AME prepares you for this.
Hence, I would advise you to go for it without any doubts.