What's wrong with the four highlighted parts of this foreign-written Chinese passage about campus bells?
Google Translate suggests 筹集 (chóují; collect money) instead of 凑集 (còují).


凑集 means a 'group of people footing the bill together' 

筹集 means 'raise funds'


  Here 前两班 is a bit confusing


From the context, '前两班' in "是前两班的同学修的" seems to refer to "previous two school years of the same class"   It should write " 是前两屆畢業的本班同学修的 (built by the graduated students of this class from the previous two school years) 


  I don't know what's wrong with 茅亭 (máotíng) = pavilion.


'茅亭' is a pavilion with a thatch roof. There's nothing wrong with using '茅亭' here.


  I'm not sure what's wrong with "这些都表示" simply meaning "these both express".


'都' here means 'all'. The sentence "这些都表示" means "All these indicate"


  It looks like 具 is the wrong measure word for 钟 = bell.



摇铃 is small handheld or hanging bell
钟 (or 吊钟) is a bigger bell that you ring it by hitting it with a mallet.  usually sit on a table or hanging in a frame, but not handheld


Classifier for 钟 like this should be '口' as in "一口钟",