Hii Bhaskar,

first of all you should focus on your board exam.because you have  English 11th and 12th.

you can take admission in B-Tech only when you have passed in English and many Institutions admission criteria is minimum 60% in Engilsh.

for preparation of IELTS please remember these points-

1. Understand the test format. Familiarise yourself with the format of the test by reviewing the content of the test, as well as the question and task types for each section. ...
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3. Practise with sample test questions. ...
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5. Official IELTS practice materials. ...
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7. IELTS Progress Check. ...
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9. Consider a preparation course. ...

here many tips are given for the prepartion of IELTS,please go through the link-

1.                      https://studyabroad.careers360.com/articles/ielts-preparation-tips
2. hope you understand
3. thank you

English is a language you can learn at any age. You don't need to be worried about it.If you want to improve your english here are a few things you can do:
1)Try learning a new word daily from the dictionary with it's meaning , use ad pronounciation.If you don't get the pronounciation in the dictionary you can use google for this purpose.
2)Try reading the newspaper daily.This will help you lear the use of words and how to skillfully use the words in a sentence. Newspaper is the best source to learn.
3) English story books or movies will be fine to make you fluent in it. 
4)And last, you can buy books on IELTS preparation and solve questions from it.

These should be enough to get you through the examination.

International English Language Testing System

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