The pie chart gives data about 
survey
 Correct article usage
a survey
from
 Change preposition
of
undergraduated
 and Correct your spelling
undergraduate
postgraduated
 Correct your spelling
postgraduate
students
 about  the university's library.Use synonyms
Overall
, what stands out from the charts is that Linking Words
while
 the majority of Linking Words
undergraduated
 Correct your spelling
undergraduate
students
 Use synonyms
preffered
 Correct your spelling
preferred
non printed
 Use the right word
non-printed
materials
, Use synonyms
the
 Correct article usage
a
big
 Correct word choice
large
proportion
 of Use synonyms
postgraduated
 Correct your spelling
postgraduate
students
 Use synonyms
preffered
 to use printed Correct your spelling
preferred
materials
.
A closer look at the charts reveals that Use synonyms
while
 more than half of postgraduates(55%) said that printed Linking Words
materials
 are 'very good', nearly Use synonyms
halved
 Use the right word
half
Use synonyms
proportion
 of undergraduates (28%) agreed with them. In bothCorrect article usage
the proportion
,
 Punctuation problem
apply
groups
 the small percentages of people marked Punctuation problem
groups,
range
 of books as 'very bad', which is between 12-22% . When it comes to Correct article usage
a range
non printed
 Use the right word
non-printed
materials
, the Use synonyms
proportion
 of undergraduates and postgraduates who Use synonyms
thinks
 these Correct subject-verb agreement
think
materials
 are sufficient and very good is literally the same, around 75%. Use synonyms
However
,Linking Words
  the
 Correct article usage
 a
big
 Correct word choice
large
proportion
 of undergraduate Use synonyms
students
 Use synonyms
believes
 thatCorrect subject-verb agreement
believe
,
 Punctuation problem
apply
non printed
 Use the right word
non-printed
materials
 are very good, meanwhile nearly 50% of postgraduates think that these Use synonyms
materials
 Use synonyms
belongs
 to Correct subject-verb agreement
belong
satisfactory
 category.Correct article usage
the satisfactory