Hi Pandurang,
Sorry to hear that you failed in the first attempt. I think the first thing you can do is to identify the root cause of why you failed those three process groups. Ask yourself: Are there any particular concepts you struggled with? Any questions that surprised you during the exam? Could it be due to technical reasons (ex. reading the question wrong, timing, etc)?
With the root cause identified, the next step we could do is to tailor a plan to overcome those issues.
Hope this helps,
Joe