It is not important to remember all the articles or sections, rather it is not possible to remember all of them. Just learn few basic articles for fundamental rights, the Fundamental Duties of every citizen, the number of seats for the Rajya Sabha, Lok Sabha, try reading articles 12-18. All these will give you a general idea. For Current Affairs, you must read newspaper of at least 6 months old and social articles, blogs, Journals and try to update yourself with current general knowledge in political, social and cultural scenario.