Class 12-science

Hello Neha,
No, you cannot do Diploma course from Nirmala Niketan after class 12th, as it have Post Graduation Diploma in Dietetics and Applied Nutrition eligibility criteria are candidate must be a graduate from recognized university.
Admission is based on marks obtained in graduation.
While if you are interested in doing certificate course in food preservation and processing then you are eligible.
Here it is a link for certificate course go through it and solve your further queries.
https://www.shiksha.com/engineering/course/certificate-course-in-food-processing-and-preservation-nirmala-niketan-college-of-home-science-marine-lines-mumbai-120202?city=151&locality=303&fro=serp&pn=1&tn=1&ct=course<i=120202&ts=87157265
Feel free for your any doubts.
Best wishes.

Bachelor in Computer Application (BCA) at BIMS is a three year undergraduate course affiliated to Bangalore University. During the course students are exposed to various areas of computer applications including the latest developments in the industry. The course is designed to bridge the gap between IT industries and institutes by incorporating the latest developments into the curriculum. The eligibility criteria for BCA is as under : For 3 years BCA program, candidates with pre university course, higher secondary school course, or an equivalent of 10 + 2 years of study, are eligible to apply.
Applying for admissions in BIMS is totally hassle-free and simple. Just go through the Admissions criteria, choose the program you are interested in and send in your application form online. Candidates should send the application form online along with an application fee of Rs. 500.
Apart from this, candidates are also required to submit attested copies of the following documents.
Mark sheet for 10th grade
Mark sheet for 12th grade
Hence you are eligible and can apply.

The following CPL scholarships are available at and administered through IGRUA, in Rae Bareilly (Uttar Pradesh):
1. Indian Airlines scholarships
Two scholarships of Rs 4,00,000, each given on merit-cum-means basis per batch.
2. Air India scholarships
Two scholarships of Rs 4,00,000, each given on merit-cum-means basis per batch.
3. Rajiv Gandhi Foundation
For two women pilots on merit-cum-means to the extent of Rs 3,00,000 each per batch.
4. Scholarships for SC/ST candidates
Rs 2,00,000 on training fee. Additional Rs 2,00,000 by IGRUA to three SC/ST candidates per batch by selection on merit cum means basis. Some state governments award scholarships to SC/ST candidates for training at IGRUA. Eligible candidates may approach the respective State SC/ST Welfare Directorate for the same.
5. JRD Tata Memorial scholarships
For four students, of an amount not less than Rs 1,00,000 on merit-cum-means basis. The JRD Tata Trust offers up to Rs 10 Lacs per year to trainees as decided by its Board of Directors. Visit the IGRUA web site for more details.
6. The Madras Flying Club offers a government scholarship as well. Eligibility: Class X + 10+2; you must also have a Private Pilot License from the Madras Flying Club.
7. A government scholarship for pilot training is available for SC/ST candidates who have completed SSC/10+2. Web site: http://www.dgca.nic.in/licencing/fly-ind.htm.