Hello aspirant!

First, breathe it's okay. You have time.

So there are a couple of options;

1. You can concentrate and properly study your 11th portions for your final exam and that way, you will know your 11th portions thoroughly and you can revise it before 12th and then again before neet. Please do concentrate in 12th as well. Don't lag behind anymore.

2. You can repeat 11th if you fail but that's not entirely certain or advisable. They might give you a retest or it might not work.

Better you gear up and start studying, it's very doable.

You got this!

Best of luck