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Hi,
Regarding preparation of CAT test I would suggest you to join some good coaching institute in your city which offers quality coaching for CAT and various other management entrance tests.
These institute offers regular and weekend classes plus they conduct mock test on regular basis.
Since you are a working professional so for you joining weekend classes would be a good option.
For your reference find below some of the finest coaching institutes which offers quality coaching for CAT.
- TIME.
- Career launcher.
- IMS and many more institutes.
I would suggest you to that before joining a coaching institute you should first start with self-preparation and stick to it for few weeks and revise your class 10 and 12th maths (CBSE/ICSE if possible) to strengthen your basics.
The number of hours that you are required to put in depends on your individual aptitude since you are a currently working so for you a minimum of 3-4 hours of self study apart from caching is a must.
Regularly give mock test, based on your performance in mock tests you may know in area you are strong and in which areas you need more hard work.
After spending considerable time in preparation it would also be advisable for you to set a clear cut target about your aspirations, whether you are planning to take admission only in top 10 colleges or top 20 colleges or top 30 colleges. The target must be realistic based on your self-analysis your preparation and your confidence in yourself.
You may refer to some of the below mentioned books for self preparation.
Quant Aptitude by Tata Magraw Hill.
Competitive Examinations Tips, Techniques, and Short-cut Methods by Guha Abhijit.
R.S. Agarawal books on verbal reasoning or Business English and Communication by Clark or Days to a More Powerful Vocabulary by Wilfred Funk and Norman Lewis.
Feel free to raise more questions. Appreciate by giving it thumbs up or marking as best.
All the Best.

Advantages of Marine engineering
the deep blue ocean world is a great resource gifted to the men. It has provided men with a lot of beneficial aspects which includes that of navigation, treasures hidden within its foetus, and petroleum or other such crude fuels find deep below its bed. All these resources are bent upon marine engineering course for their exploitation and utilization.
Marine engineering course deals with enlightening the minds of the students with the strategies for digging out the crude oil and fossil fuels from deep below the sea bed, navigational support to the ships, exploitation of off shore reservoirs, maintenance and care of ships and a lot of such other applications. Crude oil and fossil fuels deep below the sea bed is exploited and dig out by the marine engineers. The ships which unfortunately lose their way are found out and dragged back on their way by the marine engineers. This role of the marine engineers helps in saving numerous precious lives. Not to forget the maintenance and care of the ships this is dealt by the marine engineers. The upper body of the ship, its internal machines, electrical wiring and propellers are maintained by them. This helps in utilizing the ships to the best of their performance and for a longer life.
All these cite prove the great significance of marine engineering course in modern times. Hence marine engineering course proves to be a boon for the exploitation of blue world of the ocean, by men.
There will be no Disadvantages Tanish. One thing is you have to maintain stable health while working on ships