If your English level is not yet at the pre-intermediate level, it is roughly equivalent to an IELTS score of around 3.0 (TOEIC 400–525). From this level, it typically takes about 16 weeks to reach an IELTS score of 6.0.
For your reference, in terms of course selection, I recommend taking the IELTS Basic course for about four weeks and then moving on to the IELTS Intensive course.
