QuickLinks -- Click here to rapidly navigate through this document

Exhibit 99.1

GCO Education Loan Funding Trust-I
Statements to Noteholders
For the period ending January 31, 2005

Pursuant to Article 12.04 of the Indenture of Trust, the following is provided to the trustee by the issuer. The information shown in this Statement has not been independently verified, however, it is believed that the information is accurate to the best of the issuer's knowledge. In some circumstances, certain expenses have been accrued.

12.04(a) the amount of payments with respect to each series of Notes paid with respect to principal during the preceding month;

Class	Principal Reduction
A-1AR Notes	$	—
A-2AR Notes		700,000
A-3AR Notes		—
B-1AR Notes		—
A-1L Notes		—
A-4AR Notes		—
A-5AR Notes		—
B-2AR Notes		—

	$	700,000

12.04(b) the amount of payments with respect to each series of Notes paid with respect to interest during the preceding month;

Class	Interest Paid
A-1AR Notes	$	106,571
A-2AR Notes		138,371
A-3AR Notes		98,778
B-1AR Notes		26,133
A-1L Notes		—
A-4AR Notes		60,231
A-5AR Notes		112,467
B-2AR Notes		15,556

	$	558,106

12.04(c) the amount of the payments allocable to any interest that was carried over together with the amount of any remaining outstanding interest that was carried over;

Interest Carryover		$	—

12.04(d) the principal balance of Financed Student Loans as of the close of business on the last day of the preceding month;

Principal Balance of Financed Student Loans		$	360,888,453

12.04(e) the aggregate outstanding principal amount of the Notes of each series as of the close of business on the last day of the preceding month, after giving effect to payments allocated to principal reported under paragraph (a) above;

Class	Balance
A-1AR Notes	$	55,250,000
A-2AR Notes		76,650,000
A-3AR Notes		50,000,000
B-1AR Notes		14,000,000
A-1L Notes		86,397,000
A-4AR Notes		32,000,000
A-5AR Notes		60,000,000
B-2AR Notes		8,000,000

	$	382,297,000

12.04(f) the interest rate for any series of variable rate Notes, indicating how such interest rate is calculated;

Class	Rate
A-1AR Notes	2.500	%
A-2AR Notes	2.420	%
A-3AR Notes	2.570	%
B-1AR Notes	2.600	%
A-1L Notes	2.480	%
A-4AR Notes	2.450	%
A-5AR Notes	2.260	%
B-2AR Notes	2.650	%

12.04(g) the amount of the servicing fees allocated to the Servicer as of the close of business on the last day of the preceding month;

Servicing fees		Fees paid
Master servicing fees		2,500
Sub-servicing fees		36,216

12.04(h) the amount of the Administration Fee, any auction agent fees, market agent fees, calculation agent fees, broker-dealer fees, if any, fees paid to the Delaware Trustee, the Indenture Trustee and the Eligible Lender Trustee, all allocated as of the close of business on the last day of the preceding month;

Program Expenses		Fees Paid
Administration fee		2,500
Auction agent fees		—
Market agent fees (not applicable)		—
Calculation agent fees (not applicable)		—
Broker-dealer fees		57,536
Fees paid to Delaware Trustee		—
Fees paid to Indenture Trustee/Eligible Lender Trustee		—

12.04(i) the amount of the Recoveries of Principal and interest received during the preceding month relating to Financed Student Loans;

Recoveries		$	1,962,362		874,853		2,837,215

Of the total amount recovered above, $254,961.72 was in-transit as of 01-31-05, and was received in early February.

12.04(j) the amount of the payment attributable to amounts in the Reserve Fund, the amount of any other withdrawals from the Reserve Fund and the balance of the Reserve Fund as of the close of business on the last day of the preceding month;

		Balance			Withdrawals
Reserve Fund		$	4,200,000		—

Acquisition Fund:

12.04(k) the portion, if any, of the payments attributable to amounts on deposit in the Acquisition Fund;

	$	—

Total	$	—

12.04(l) the aggregate amount, if any, paid by the Indenture Trustee to acquire Student Loans from amounts on deposit in the Acquisition Fund during the preceding month;

		$	—

12.04(m) the amount remaining in the Acquisition Fund that has not been used to acquire Student Loans and is being transferred to the Revenue Fund;

		$	—

12.04(n) the aggregate amount, if any, paid for Financed Student Loans purchased from the Trust during the preceding month;

Loans Sold From the Trust		$	—

12.04(o) the number and principal amount of Financed Student Loans, as of the close of business on the last day of the preceding month, that are (i) 0 to 30 days delinquent, (ii) 31 to 60 days delinquent, (iii) 61 to 90 days delinquent, (iv) 91 to 120 days delinquent, (v) greater than 120 days delinquent and (vi) for which claims have been filed with the appropriate Guarantee Agency and which are awaiting payment;

Delinquencies	Number	Principal
0-30 days*	329	$	9,080,388
31-60 days	263		8,187,439
61-90 days	139		4,855,410
91-120 days	68		2,165,329
Over 120 days	177		5,946,714
Claims filed	19		676,733

	995	$	30,912,014

*: One subservicer does not provide information on delinquent loans that may fall in the 0-30 day catergory.

12.04(p) the Value of the Trust Estate and the Outstanding principal amount of the Notes as of the close of business on the last day of the preceding month; and

Value of the Trust Estate	Balance		Accrued Interest		Total
Revenue Fund (Including Capitalized Interest Account)	$	7,154,790	$	11,408	$	7,166,198
Reserve Fund		4,200,000		8,086		4,208,086
Acquisition Fund		—		—		—
Redemption Fund		2,914,204		3,859		2,918,063
Student Loan Receivable		360,888,453		3,447,953		364,336,406

Total	$	375,157,447	$	3,471,306	$	378,628,753

Class	Balance		Accrued Interest		Total
A-1AR Notes	$	55,250,000	$	23,021	$	55,273,021
A-2AR Notes		76,650,000		139,120		76,789,120
A-3AR Notes		50,000,000		89,236		50,089,236
B-1AR Notes		14,000,000		27,300		14,027,300
A-1L Notes		86,397,000		398,770		86,795,770
A-4AR Notes		32,000,000		37,022		32,037,022
A-5AR Notes		60,000,000		86,100		60,086,100
B-2AR Notes		8,000,000		10,011		8,010,011

	$	382,297,000	$	810,580	$	383,107,580

12.04(q) the number and percentage by dollar amount of (i) rejected federal reimbursement claims for Financed Student Loans, (ii) Financed Student Loans in forbearance, and (iii) Financed Student Loans in deferment.

	Number	Principal		%
Rejected federal reimbursement claims	—	$	—	0.00	%
Financed Student Loans in forbearance	813		36,108,378	10.01	%
Financed Student Loans in deferment	1,654		56,283,727	15.60	%

QuickLinks

GCO Education Loan Funding Trust-I Statements to Noteholders For the period ending January 31, 2005

GCO Education Loan Funding Trust-I 8-K