There isn't an exact solution to this Mathematics challenge. First of all I practised; playing on the game getting used it. Then I introduced many different strategies, repeating them several times, recording down the score I finished with each time, with each strategy before it. I pressed the '10 viewings button once' then made a guess straight away. This lowers the amounts of points lost, as I didn't press the '10 viewings' button more than once preventing me losing 10 points off my overall score.
My most successful strategy was:
To press the '10 viewings' button once(the marbles will show up on a table), then make a guess straight afterwards. I took one marble off the amount of marbles recorded on the results before. For example if I recorded having 3 Reds, 3 Yellows, 2 Greens and 2 Blues, I would take off 1 Red, 1 Yellow, 1 Green and 1 Blue. This shows now on my 'Make a Guess' section that there are 2 Reds, 2 Yellows, 1 Green and 1 Blue. Now, this leaves 4 empty sections. So what I did was divide the 4 sections between the lowest colours. This provided 2 more sections for Green and Blue. I was surprised by these results and tried out my strategy 20 times and the lowest rating I got was 'Ok'. I scored 'Perfect' 4 times and 'Really Good' 12 times.