if you look at theieltspublic band descriptors(available to download if you do an internet search or available from your local ielts centre), you will see that this could reduce your band to a 5 for this criteria (it would not necessarily affect the other three criteria).
there are many benefits to reading electronic books. the space required for storing electronic books is very small compared to the space required for storing printed books. electronic books can be stored in small pen drives or in cds and it is easy to carry them around. actually hundreds of books can be stored in a small pen drive. by contrast, a large amount of space is required to store paper books. people usually need a room to keep their academic books. another advantage is that people can buy ebooks online and download them to their device within seconds of completing the purchase. but if they buy paper books online, they have to wait for days or even weeks before their order is delivered. better still, ebooks are eco-friendly. since they do not require paper, no trees are cut down to produce ebooks. in addition, it is possible to get books published in different parts of the world. people can read books which are usually not available in their local stores.the biggest disadvantage of ebooks is that they require us to stare at a screen for a long time and thus they may cause eye strain and other problems. more and more people have vision problems in the modern world because of the extensive use of computers. however, when compared to the convenience ebooks provide, this problem is negligible and also, vision protection screens for computers are available now.in conclusion, it is not hard to see that ebooks are better than paper books in many aspects. they are portable and they dont occupy physical space. they might cause eye strain but it can be easily prevented by using protective screens.