Does this translation of a sentence accurately capture the information and grammar of the original sentence?
My translation is "Undergraduate Chinese Student Organization's and the Beijing Students Studying Abroad Friendship Club's courses about car knowledge are coming. These courses are free to all freshmen and current students. Do not miss it."

即将 means will happen very soon. So you can use "is coming" or "is on the way".

old means 年龄上的“老”. It is better to say "current students".

"take advantage of" means 利用. It is not positive here. It is better to use "value" which means 珍惜.  

Hopefully, it can help.