A level sciences required practicalsWatch this thread
There are a set number of required practicals in your course and you will perform them, taking notes and writing your methods, results and conclusions in a lab book (though it's not necessary to have a lab book, most schools do it). These practicals can then be assessed during your written papers, there will be a few questions in your paper based on practicals which will either be the same as, or very similar to your required practicals - asking questions about equipment, drawing graphs, hazards ect. - hope this helps
No worries! It's not so much about the exact practicals you do, but more about the skills from them and learning certain things (e.g. what a source of error would be when using a burette). I'd say maybe 2/3 questions per paper are on practical skills, usually have a calculation as a main part of them.