What you do with old documents??

with regard to PE-I  or CPT and PE - II or PCC or IPCC you may need to have only the pass certificates and marks memos of passed examinations but for final examination you have to have the failed examination attempt details and Roll No ( will be available in Marks Sheet) because in fillingup of examination form of final you need to give past examination details ,so keep final marks sheets

and there is no need of halltickets of All Examinations since in marks sheet you will have Roll No