if you have studied semiconductors then do maybe on basics bcc, fcc structures. would be helpful to you even in exams in understanding
i don't remember now if this was in 11th or 12th though
why do schools ask for such bullshit puzzles me. What will anyone gain after making a diagram of vernier callipers, instead a practical class might do everyone a lot of good.(alas schools never conduct a practical class seriously do they?)