Writing Feedback / Some think that students should study mainly science and math in order to prepare them to job market [6]

I think you change "finding" to "experts" or adding "s" to finding and change "says" to "say" and add person to before "who"
Many finding experts says that "people ... live longer than persons who ... "

Writing Feedback / IELTS Task 1: Occupied and available types of living accomodation in London [4]

I have some suggestions as below. And you may consider to use noun after preposition.

he rate of shared house house-sharing and shared flat flat-sharing in the 2010s was were higher ...

There was were also changes in the available of housing in London in between 1990s and 2010 onwards.