On the questions like this, we must have to think intelligently and not emotionally.
Let it be boards or any other important exam. If we just have one month for now and that too with the zero level preparation we shouldn’t dreaming of excelling it the best.
But as there is a will, there is a way! We should plan it accordingly for this particular one month.
Since we have this one month only, cut off yourself from all the distractions and unnecessary things.
Collect material from where you will study, get any short notes you get from toppers or coaching. (We shouldn’t waste time on making notes or jotting down anything here)
Now, through the previous years papers, analyse what chapters or topics could give you best results.
Study them and solve questions (don’t try to solve them just figure out the concepts and process will be needed to solve that problem).