I am 11th class student and in the final all India Aakash test series I scored very bad. Will I be able to give to Neet in 2019

Easily. Don’t be too hard on yourself. Stay true to your studies, that’s all that is required.

Don't judge yourself  on the basis of marks and rank obtained in any test series... I have seen many people scoring goid marks and rank in test series but in neet ug they had performed worsly and conversly i have also seen people who have not done that much good in test series, but they did very well in their neet ug exam..
So just focus on your weak points and make them strong and practise them as much as you can..
You will do wonderful in neet ug 2019.
Good luck..

Yes. Please note that Aakash test series is a hell lot difficult than actual NEET exam. Please, don't get demotivated by Aakash test series. They don't reflect your NEET preparations. Many candidates who score bad in these tests end up cracking NEET without any difficulty.
Sit back and relax.
All the best.

Yes you can do well in NEET.in the test series the questions asked are little bit harder so don't worry about that work hard
All the best