Delhi

NIBMT (NATIONAL INSTITUTE OF BUSINESS MANAGEMENT & TECHNOLOGY) courses are valid for all kind of jobs and higher studies, it's a government recognised institution, NIBMT courses are also valid for Overseas jobs, it's a ISO, KVQA, NORSK, JAS & ANZ certified institution, and it's a member of AIMS (association of Indian Management Schools) & ATMA (Aims Test for Management Admissions) 

NIBMT is a self autonomous Institution 

so NIBMT doesn't require UGC (UNIVERSITY GRANTS COMISSION ) approval,  

( it's a very good platform for working professionals to enhance their education and career too ) 

The best engineering colleges of New Delhi are as under.

1. IIT D
2. JMI
3. IIITM D
4. Bharati Vidyapeeth college of engineering

Of course, you will get admission in Delhi University.

But, you have to give the CUET UG exam conducted by NTA. The university will take addmission of only those students who have appeared in CUET UG .

Thank you.

The majority of admission in BA courses done on the basis of CUET UG scores conducted by NTA. However the list of few colleges is given below.

1. Sri Venkateshwara College DU
2. Delhi college of arts and commerce DU
3. Maitreyi college DU
4. Bhartiya Vidya bhavan, New Delhi 
5. Jagan institute of management, Delhi 
6. Maharaja Agrasen institute of management, Rohini Delhi 

It depends on the college as it is a college specific rule so basically in DU you have to pass atleast 50% total credits in previous year to get promoted in to next year but if failed to do so then you have to repeat the year without promoting to next year. However if you failed due to short attendance, try to apply attendance waiver due to medical reasons or emergency reasons if you have any.

I recommend you SkillWisdom.com as I have done Python course from there.