I'm coming in late to this discussion. You seem to have discussed eariler, but I find no additional posts under your name. I will assume that you are following the experiment at http://www.sciencebuddies.org/science-fair-projects/project_ideas/Phys_p028.shtml#summary
While the fine points of how the prism is aligned are critical for getting good measurements of the refraction angle, I am most concerned that you are not seeing an increasing total angle of refraction as you increase the amount of sugar. The increasing angle vs. sugar content should be seen even with a wide range of alignments.
I suggest that you set up an alignment like that shown in Figure 7 of the Procedure
section and leave it in place. Then try putting clean water and then a strong sugar solution in the prism. If you don't see a larger refraction angle and a corresponding larger x as defined by Figure 7 when you change from water to sugar solution, then I think you must not be using plain sugar (sucrose). It's hard to imagine any other explanation.
Once you have verified that sugar solution bends the light more, you can work on refining the setup for accurate measurements.
Good luck, WW