Surabhi,
If I understand correctly, then the test you are preparing for is IELTS, which stands for International English Language Testing System, which is an international standardised test of English language proficiency for non-native English language speakers.
In order to earn PDUs PMI wants you to receive education in project management, leadership as well as strategy and business.
It seems very unlikely that the IELTS test is providing any training in these three areas, so I would say that you cannot use it claim any PDUs for your recertification.