Not really the best. Burdens are heavy. Pressure is high. Neither sentence is precise. For example, a Chinese student could be a student in China or someone studying Chinese. The burden on students in China is too heavy. The pressure is too high on students in China.

I would say 'pressure'.

Both burden and pressure are fine. I think the correct phrasing is: "The pressure to study...". I honestly can't explain why sorry haha