redmi note 3 problems

Hi guys I using redmi note 3, previously I used sony e dual that phone was multi using but this phone not much better I have facing some problem please give solution
1. how to completely remove system apps (not disable) all google apps(chrome-,you tube,Google Currents,Google Play Music,Google Play Movies,Google Play Newsstand,Google Keyboard,Google+ etc these apps are eat lot of RAM space if delete these apps mobile perform will increased

I want other apps instead of these apps because better apps is working fine in play store.

2. phone was not connecting with computer without pc suite,
when I connect phone via USB cable to computer files will transfer to any computer but this is not possible in redmi note 3

3. boot loader unlocked can possible delete system apps please suggest me

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