This booklet written by Arun Kumar Rai is about various aspects of Saath Tithi, the seven day celebration of Koch Rajbanshi New Year. This booklet is written in Kamatapuri language of the Koches and explains various rules, regulations and importance of observing the Sath Tithi. This booklet is a rare publication and now preserved digitally at CKRSD archive. CKRSD is working very hard to preserve rare documents on Koch Rajbanshis for protection their heritage.