1. tuition fees are difficult to pay: black families usually cannot obtain formal proof of work and income, so they cannot enjoy educational assistance policies such as loans or grants, which makes it difficult for their children to pay for college.

2. Qualification restrictions: Some colleges and universities require students to provide identification and official accounts when enrolling students, but black families often cannot provide these documents, so children may be refused admission.

3. Employment pressure: After graduating from college, children of black households face difficulties in finding jobs. Without legal identity and registered permanent residence, they may be restricted by employers, unable to obtain stable job opportunities, which increases the uncertainty of employment and competitive pressure.

Summary: Black households have an important influence on children's going to college. Difficulties in tuition payment, qualification restrictions and employment pressure are the main problems. To solve these problems, relevant departments need to introduce more policies and measures to provide more educational support and employment opportunities for black households.

Extended data:

-The education department in China should strengthen the education subsidy policy for children from black families and provide them with more educational resources, such as loans, scholarships and tuition fee remission.

-Colleges and universities should be cautious about the admission of children of black households, and avoid excluding qualified students because of identity certificate restrictions.

-Children from black families can consider choosing flexible vocational education or skills training to increase employment opportunities and competitiveness.

The above extended materials provide some ideas and suggestions for solving problems, but they need to be specified and operated in relevant policies and regulations in order to be truly implemented.