Vigyapan means advertisement so in vigyapan lekhan we have to design an advertisement of specific item or topic. You should remember that vigyapan should be in a box. If it is accompanied with a drawing of a topic it will look more attaractve and u can gain more marks. It will be better if u use rhyming words and easy language. The topics can include like to promote swachh Bharat abhiyan, beti bachao abhiyan, bijli bachao abhiyan,. I had to create vigyapan to promote a pencil company in my exam. I used words like"likte jao like jao, bins kisi rukavat ke kyunki apke likh rahe hein max pencil se"