I want to start my preparation for GRE and IELTS from now. I will take the exam in December. Is this right time to start?

Indian students who want to take admission to European University have to submit TOEFL / IELTS scores (B2 level English proficiency). The minimum scores required in these tests are-

This tense is important for students. It helps improve grammar skills. Students use it in speaking and writing tests.

Correct use makes sentences better. It also helps explain ongoing actions clearly. 

We use the Present Perfect Continuous Tense for actions that started in the past. These actions are still continuing now. It is also used for repeated actions. Sometimes, the action has recently stopped. But its effect can still be seen in the present.

Present Perfect Continuous Tense is used to describe actions. Which were started in the past and are still continuing in the present.

It mainly focuses on the activity duration. Often uses words like "Since/for" in sentences.

For example:

1. Sita has been cooking dinner for two hours.
2. She has been working

Yes, IELTS score at Norwegian University of Science and Technology (NTU Norway) is accepted. It also accepts TOEFL / PTE scores. Minimum scores required in these tests are-