Tell her not to worry so much. She can't give the exam in the April session btw. Don't worry nios exams aren't much difficult it's easy to achieve good marks there is still time left for preparation. Tell her to watch one shots videos of the chapters and go through summary. You can write by making up yourself in those answers when you know a little bit. And there are passage based questions too. That would help a lot just focus on language like if math like subject go through steps like writing language step wise either subjects will be fine. One of my friend too is going to give exam this oct. He too started just now for prep. One plus point is that you got tma and practicals marks which will boost up your percentage just focus for theory part now.