i have seen A LOT of past papers on dicot roots, stems and leaves..so make sure you know them well.. and while making diagrams be sure to draw clear, sharp lines that dont cross eact other at all.. they are extremely picky about it
for the other part learn how to make dilutions..
when they ask you to draw a table make sure it's a closed one..another thing they are picky about
thats all i can think of right now..just go over a few past papers..it is very helpful. and manage your time properly!
good luck to everyone who is taking it!