Correct:

Nowadays, many technologies are improved, also the applications. Many
 things are controversial. However, there are a lot of applications that can be used for education. So I agree with this argument.
First of all, technologies can be used for education by using useful applications. If we use them in school, it would be better than before because
we don't need any limited book or blackboard.
Secondly, students will pay more attention.  When you see a class in       middle school or highschool, 5 or 6 students are sleeping in each class. But
when we use technologies in school, the students will pay more attention, because it's more familiar for them.

Explanation:

1.Be mindful of the proper spelling of a word.
2. Use the preposition 'with' when you refer to supporting someone or something
3. Use the preposition 'for' when you refer to something that has a particular purpose
4.The expressions 'pay attention' means to look at or listen to someone or something carefully
5. Use the determiner 'each' for singular subjects. Each means every one in a group.

Comment:

Thank you for doing your homework Jonathen. I am glad to know your side about utilizing technology in school. Keep up the good job!