Original
At almost / around / about / approximately 95 percent of the sample, Language of tuition is the main B. reason behind students choosing university.

Altered So Works Grammatically

At almost / around / about / approximately 95 percent of the sample, Language of tuition is the main reason given by students choosing / reason give for choosing university.


Original
Language of tuition is top of the survey  J. with approximately 95%.

Altered So Works Grammatically

The top of the survey  J. with approximately 95% is given as Language of tuition.


Using "is given as" With A Number
In our class, the biggest number is given as 10,000 trillion.
= Using the Passive to focus on the object instead of the subject.

In our class, people say the biggest number they can think of is 10,000 trillion.
= Using the Active to say who did the action (I.E. said something)



Using "is given as" With A Thing

For most people, chocolate is given as their favourite flavour of ice cream.

= Using the Passive to focus on the object instead of the subject.

Most people say that their favourite flavour of ice cream is chocolate.

= Using the Active to say who did the action (I.E. said something)