Difference Between IELTS, TOEFL, GMAT And GRE | GMAT vs TOEFL vs IELTS vs GRE | Intellipaat

I am 34 and this is my 9th year in a public sector bank.
What exam should I give for a better career?
And what course should I pursue?

Sir
i want to be expertise in English communication .
Can I take coaching of IELTS ?
If you have any suggestions so advice me .

Is IELTS training is there in Intellipaat ???