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Hi there, Glad that you're thinking to learn more about one of the most booming and career promising fields in the current time, which is Data Analytics. As this is quite popular and popular among the students in terms of learning and making a good career in it. Coming back to your question, there are many platforms that you can consider for learning Data Analytics from scratch. For that, I would suggest taking up any short-term courses from well-known organizations. For that, I would highly recommend Imarticus Learning, which is an educational institute that provides training programs on the Business, Analytics, Information Technology related fields. To become a successful Data Analyst, you can consider the following programs:
1. The *Big Data Analytics Courses*https://imarticus.org/post-graduate-program-in-data-analytics
This 450+ hours power-packed programme in analytics not only allows you to acquire in-demand future skills but also enables you to start your career as an accomplished Data Scientist. Your only responsibility is to learn, we do the rest.
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The PG programme in Analytics and AI will ensure you learn practical applications of Machine Learning and AI. This job focused programme will accelerate your entry into the roles of data scientist, analyst, or machine learning engineer. For more information and further career counseling, you can also search for and can drop your query by contacting through the Live Chat Support system or can even visit one of our training centers based in - Mumbai, Thane, Pune, Chennai, Bangalore, Hyderabad, Delhi, Gurgaon, and Ahmedabad. Hope this will work for you!
Regards :). .

I have got overall 7.5 bands in IELTS Academics. So, my suggestions are based on that level. I am also assuming you know tenses and other grammatical stuff (I have less problems in this area. It is natural for me)
If you want 7.5 bands prepare for 8. Get a practice partner for speaking preparation. Get a reference material. E. g. makkar IELTS. It is paid but you can find pdf online for free just by googling it. Make sure that you are reading the latest version. Reference material will help you to give reply spontaneously. It will prepare your mind and will compensate for imagination in most part (although you can't answer as per reference line by line, examiner will certainly notice it. Say bye to your 8 or 7.5 in speaking if you do this).