Can you learn all these computer stuff in only 3 months?

I'd have to say it depends how bad you want it. Study your brains out, ask lots of questions. learn everything you can off the internet, videos, tutorials, whatever, maybe take an online cl if you can, volunteer to be an apprentice somewhere else...you'll get out what you put in..look for opportunitites to learn if you want to learn fast and just immerse yourself in the topic day and night. Wake up thinking about networks..go to sleep thinking about networks..become obsessed...