There are various topic to do a project on stock Market.But I think your "in charge' of study center should choose it and if he allow you to do as per your choice then you can choose.
You can make your Project on:
1.Initial Public offering system of any limited company under SEBI Act.
2.Online Stock Trading activities including derivatives trading.
3.Port folio Management
4.Accounting of Stock Broker including statutory Books of Accounts maintenance.
5.Assessment procedure of Stock Broker.etc.