Ca Final subjects include DT (i.e almost whole of income tax act including all that you studied in ca IPCC), IDT includes custom, excise, st, FTP( out of which you ST is most imp as it consists of marks and it includes all that you have studied in IPCC), costing(which includes relevant, marginal, budget, standard, operating), ISCA( i.e IT), accounts(which includes Amalgamation, Holding, All AS), SFM( having Cap Buj, forex, derivatives, portfolio), law( i.e. companies act and few allied laws), And auditing(including all SA, company audit etc).
now, until you tuition commences you can make your Income tax law of ipcc level perfect as that will help you both practically as well as in your exams. you can also take up the topics mentioned above all of which you have studied in your IPCC. this will surely benefit you in the exams as well as in office.