Critical thinking tactics essential for essay writing in UPSC include the ability to formulate a clear thesis, develop well-structured arguments, and analyze issues from multiple perspectives. Candidates should begin essays with a concise introduction outlining the main argument, followed by logically organized paragraphs that delve into supporting points. Employing examples and evidence fosters credibility and depth, while counterarguments can highlight a nuanced understanding of the topic. Additionally, utilizing a strong conclusion that reinforces the thesis and suggests practical solutions is vital. Practicing these tactics consistently across various essay topics will enhance overall writing quality and analytical skills, crucial for UPSC success.