not sterile
If you have actual benzoin, use it as opposed to your tincture of benzoin. Unless you know the strength of your benzoin tincture, you could go from there. 1-3% might be a good start. How about 1.5%. eg: 98.5% perfumers' alcohol, 1.5% benzoin.
SYRUP
A experiment should only have one variable.
An experiment should be designed to answer a specific question.
It depends on what your experiment was. You should ask a teacher or someone that you know who has done this before.
The data should be organized and the experiment's materials cleaned?
temperature
Any experiment should start with a hypothesis.
you must repeat and redo the experiment
That should probably be "Millikan". The experiment he was famous for is the Millikan Oildrop Experiment.
analyze your data
No redo the experiment.