That's a lot of acronyms, but it translates to United Kingdom Mathematics Trust: Intermediate Maths Challenge - Gold certificate!
The Gold Certificate is given to the students who scored 73 or more points on the test. But since I was able to proceed to the Pink Kangaroo Round means that I scored 76+ points on it! It was such a pleasant surprise because it was my first time being able to go further than the actual test. All the hard work I had put it had paid off :)