Can you pass JLPT N4 by self-studying 5 months with Genki 1 and Genki 2?
On what sections from JLPT N4 should I focus more?

Question

Answer

I don't know, but everything is possible! :)
I'm preparing for N4 in december, too^^
And I'm studying from Genki.
This can help you:
http://www.learn-japanese-adventure.com/

Answer

Please take a look at this site. Though I don't know about JLPT, some of my friends said that this would be helpful. http://www.tanos.co.uk/jlpt/jlpt4/

Answer

I'm not sure about JLPT N4, but definitely you can pass N5.
Usually students pass N4 after learning Japanese 1 year in university.
I recommend you to download online some samples of exam and try to pass it. 
And don't forget that JLPT is not about general knowledge it's more about knowing the exam structure and prep to this exam. I know one guy who passed N1 after 1,5 year in university.
So try ;)

Don’t miss out on the opportunity to learn a language from the comfort of your own home. Browse our selection of experienced language tutors and enroll in your first lesson now!