See if you are looking for mock test then 

Previous year neet exam that you can have You google it are one source which are free of cost

Secondly their are some  which put their mock test 1 or 2 on web when you google it you can get it

Lastly the aitas( aakash) allen or resonance test series you can get as their dlp programme or at centre whatever's suit you

Firstly go through well with NCERT books properly as it will help you to build your concept. And If you are looking for free online test series, you can not reliable on this so I would suggest you for Allen, Akash or Ressonance.

For free online test series you can prefer merit store.

Good Luck!

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