21st Century Higher Education Act

21st Century Higher Education Act - Amends the Higher Education Act of 196 (HEA) to revise and to extend and increase the authorization of appropriations of HEA programs, including: (1) Pell Grants; (2) Federal Trio Programs; (3) Gear Up; (4) Federal Supplemental Educational Opportunity Grants; (5) College Work-Study; and (6) Strengthening and Developing Institutions.

Establishes new HEA programs, including: (1) Byrd Honors Teacher Scholarships; (2) Dual Degree Achievement; (3) Community College Opportunity; (4) College Preparation; (5) Promoting Postbaccalaureate Opportunities for Hispanic Americans; (6) Collaborative Centers of Excellence in Teacher Preparation; and (7) a demonstration program in recruiting and preparing teachers.

Tribal College or University Teacher Loan Forgiveness Act - Establishes a new HEA program of specified Federal student loan repayment or cancellation for individuals who teach for up to five years in Tribal Colleges or Universities.

Access to High Standards Act - Amends the Elementary and Secondary Education Act of 1965 (ESEA) to establish Advanced Placement (AP) programs of assistance grants to increase the access of low-income students to AP high school courses and AP tests to earn advanced placement and credits at institutions of higher education.

Dropout Prevention Act - Establishes a new ESEA assistance grant program to address school dropout problems, including a coordinated national strategy and a national school dropout prevention initiative.

NTIA Digital Network Technology Program Act - Amends the National Telecommunications and Information Administration (NTIA) Organization Act to direct the Secretary of Commerce to establish within NTIA's Technology Opportunities Program a digital network technologies program to award grants, contracts, or cooperative agreements to eligible institutions to provide educational instruction in digital network technologies.

Amends the Omnibus Parks and Public Lands Management Act of 1996 to authorize the Secretary of the Interior, with respect to eligible Historically Black Colleges and Universities, to make at least 15 annual grants for buildings or structures listed on, or eligible for listing on, the National Register of Historic Places, if the grantee agrees to provide funds derived from non-Federal sources in an amount equal to 25 percent of the grant.