For the microscopy required practical it is a bit vague in stating just plant or animal cell slides so it's really up to the individual to choose which they think will do the job. Here they prefer Ligustrum for the plants and trachea for the animal - they just sifted through what we already have and chose those. Ask those concerned if there is anything they would prefer
We use various as I have the slides listed on the computer system so each teacher knows what is available. Majority seem happy with just leaf slides, algae, intestine and epithelial slides. The root tip slides they wanted to keep for y12 and 13.