Advice

I am a BSc Maths Hons graduate, I am really clueless about what to do now, I have appeared for CAT this year but couldn't get a very high percentile I want to know about what skills, courses or certification can I do right now to build a CV under 6 months so that I can start applying for jobs and internships, pls help me, any suggestion and advice u have will me help me immensely.