Sentence 1 sounds good to me.
"Between 2000 and 2010, there is a slight rise from 2 million to 3 million college students studying science in China"
if you are looking at a graph of the data, then you can say this. This would mean that you are looking at the graph in present tense and stating that there is a difference.
if you are talking about the past, then you will need to change it to:
"Between 2000 and 2010, there was a slight rise...." or
"Between 2000 and 2010, the number of students studying science in China rose from 2 to 3 million."
Hope this helps.