The final exam is approaching. Some students take it seriously. Other students take it as it comes. (compound-complex sentence)
When the final exam is approaching, some students take it seriously, and/but other students take it as it comes.
The final exam is approaching. Some students take it seriously. Other students take it as it comes. (compound-complex sentence)
When the final exam is approaching, some students take it seriously, and/but other students take it as it comes.