The instant invention provides an intergrated kit with solutions and instruments to isolate various biological samples from biological samples. The kit enables an user to preserve specimens and isolate biomolecules with features and benefits of high quality, easy, fast, no toxicity, safe to user and environment, low demanding, cost-effective, reducing waste, saving nature resources and protecting environment, and leads to a low-carbon and Green economy in preparation of specimens. The integrated kit enables the user to extract biomolecules including DNA/ccfDNA, Large RNA/mRNA/ccfRNA, Small RNA/miRNA/ccfmiRNA, Protein, Lipid, Carbohydrates, and Metabolite using one seamless procedure.