Effective resource materials for general studies preparation for the UPSC include comprehensive textbooks, online courses, and coaching materials. Standard books like NCERT for foundational knowledge, along with resources like Laxmikant for polity, GC Leong for geography, and reports from organizations like UN and World Bank for current affairs are essential. Utilizing online platforms for updated study material and test series also enhances understanding. Staying organized and consistent in studying these resources is key to thorough preparation for the exam.