The Standard Repayment Plan saves you money over time because your monthly payments may be slightly higher than payments made under other plans, but you will pay off your loan sooner. You end up paying the least amount of interest over the life of your loan.
can I use other loans to have you look at when you work out the repayments on a Direct Consolidation Loan?
Yes, list those loans on your consolidation application in the section for listing loans that you do not want to consolidate, but want considered in the determination of your repayment period.