In September 2019, M1, the first hybrid engine designed by BiSKY Team and never before ignited by a student team in Spain, was fired up for the first time. Since then, we have been immersed in an extensive testing campaign to conduct various tests. The creation of M1 allowed us to learn how a rocket engine is built and designed. At the same time, the first fuel tests were carried out to properly establish the difference between calculations and reality, and it has allowed us to advance in the degree of understanding around the combustion of paraffin. It has been reused in several tests, as these provide us with very valuable information.