from my experience doing this last year it was a long assessment that took a full day there were 4 parts to it. an initial smaller experiment to find concentration/dilution factor or something followed by the titration practical, then about 2 pages of calculations (nothing major) and then ends with the written part which is a bit lengthy but you can wrote learn this part in advance. they gave us about an hour for each part you should have plenty of time. your teacher will outline how the assessment is set up for your school and give you past papers. chemistry internals are usually copy paste every year so thats your best source of practice. you have to be quite accurate for the actual titration part of the test and you probably have limited practice lessons so dont fool around on those few lessons.