Basic knowledge on Science is very important. You cannot proceed to the lesson if you didn’t fully understood the previous lessons or topics discussed. In Science as well, each information is interconnected. It’s like a puzzle that you need each piece to form the whole picture. For example, water that is being discussed in photosynthesis (biology) can also be interrelated to chemistry since water is a molecule that is formed by Hydrogen and Oxygen atom. Such basic ideas stated above, I am willing to help you learn your basic science. It can be biology, chemistry and earth science.