Relax, dress up, and don't be late.
The interview is nothing more than financial related content, and how much do you know about futures? It is impossible to ask you what futures are.
The main contents of futures company finance are similar to those of other companies. You may need to make some deposit and withdrawal statements, and some companies also open accounts. You should also know the procedures of futures accounts. General companies will give you an internship probation period. In the meantime, study hard with the old finance.
There are also futures companies that require a futures qualification certificate. If not, try to get it during the trial period.