There are several tricks to remember the Prime Ministers of India. Here are some of the most effective ones:

1. Mnemonics: Mnemonics are memory aids that help you remember information by associating it with a word or phrase. For example, you can use the phrase "Indira Gandhi Always Needed a Man" to remember the order of Prime Ministers from Independence in 1947 to 1991, when Rajiv Gandhi was assassinated. The first letter of each word corresponds to the initial of the Prime Minister's name in order: Jawaharlal Nehru, Lal Bahadur Shastri, Indira Gandhi, Morarji Desai, Charan Singh, Rajiv Gandhi, and V.P. Singh.

2. Association: You can associate each Prime Minister with a particular event or characteristic to help you remember them. For instance, you can remember Lal Bahadur Shastri as the Prime Minister who coined the slogan "Jai Jawan Jai Kisan," which means "Hail the soldier, hail the farmer." Similarly, you can associate Atal Bihari Vajpayee with the Pokhran nuclear tests, which India conducted during his tenure.

3. Chronological Order: Another method is to remember the Prime Ministers in chronological order. You can start with Jawaharlal Nehru, who was the first Prime Minister of India, and then move on to the subsequent ones in order. This method is helpful if you need to remember the order of Prime Ministers for a particular period, such as the 1960s or the 1990s.

4. Visual Aids: You can use visual aids such as pictures or diagrams to help you remember the Prime Ministers. For example, you can create a chart with the names of the Prime Ministers and their tenure, or you can draw a timeline with their pictures.

In conclusion, there are several tricks to remember the Prime Ministers of India, such as using mnemonics, association, chronological order, and visual aids. Choose the method that works best for you and practice regularly to improve your memory.