H1 Chemistry is a subset of H2 Chemistry topics but H1 has additional topics, Polymer and Nanotechnology. Due to the smaller candidature of H1 Chemistry, it is difficult to get an A for H1. A common misconception is that if you are getting S/U grade for H2, you can can A for H1. This is a myth, you will most likely be getting E for H1 Chemistry. The best bet is still to seek help from an experienced H2 Chemistry Tutor, such as Mr Kelvin, as early as possible to sort out any issues with H2 Chemistry.