I'm a final year student, and I want to learn Japanese to get a good job there. How long will it take to learn the primary Japanese language, i.e. speaking, writing and reading for me? Also, please tell me how can I qualify for JLPT tier 2 as soon as possible as it is essential for me.

Hello Bhaskar,
To answer your question, please understand that there are a total of 5 levels in the JLPT examination. N5 being Beginner level, you need to complete upto N3 level to have good command over the Japanese language. N1 level is known as Expert level, and if you complete it, you are recognised at par with Native speaker.
Ideally, you will require anywhere from 8 months to 12 months to complete upto the N3 (Intermediate) level, while basic levels can be completed within 6-8 months.

Hi,

To learn any language quickly means you are leaving so many vital points because our brain takes a specific time to learn a language. About Japanese, we have 3 Scripts that need to be mastered anyhow because without learning Alphabets, no one can master any language. About Japanese, the most challenging part is the script which takes a long time to learn, and about grammar, Japanese grammar is simple to go. You must learn upto N2 and get a certificate from JLPT. Examination in India conducted by JLPT Twice a year. It takes at least six months to complete one Level. In Japanese, the level starts from N5 to N1, where N1 is a level where one feels like a Native Japanese.

Learning a new foreign language is quite a task, particularly in East Asian languages such as the Japanese language. One can not precisely say how long it will take to acquire primary language skills. As you have asked, reaching ahead, many factors may affect time & duration and proficiency, such as age, cognition and learning background.
According to the JLPT standards, the student who has completed 300 hours of Japanese language learning 300 kanji and 1500 vocabularies can be said completed elementary level. Generally, it takes 5-6 months. However, new foreign language teaching methods such as TPR, audio-lingual, communicative approach, silent way etc., may help and make the learning process comparatively more effective.
In so far, JLPT N2 is concerned; it is advanced intermediate level. It may take a year and a half, depends on the learner's enthusiasm and interest. In addition, language is spoken, so you must learn not only the language but also the essence of the language, which incudes the social-cultural and linguistic aspect of the target language. I hope this may help.
Feel free to ask for any help.