Exam

Yes, you can also appear for the improvement examination in Physics if you have given your 12th examinations under the CBSE board. The eligibility criteria are passed in their 12th exams within the last two years of taking the application forms. And since you also said you completed 12 last year, therefore you would be eligible for taking this improvement exam also this year. You may decide to upgrade your grade in one or more of the five core subjects, which would include Physics. However, do note that you can sit for an improvement exam only once in a particular subject, and that has to be in the same year you take your board exam.

The Rashtra Raksha Academy (NDA) is a government college in Maharashtra that trains students for the Indian Army, Navy and Air Force: 
Location: Khadakwasla, Pune, Maharashtra
Here is some information about the NDA:
NDA is the world's first triple-service academy. 
Cadets receive free education, accommodation and medical care during their training. 
To be eligible for admission, students must have passed Class 12 and registered on the UPSC website. 
Candidates will also have to appear for the NDA entrance test, followed by a personal interview and medical examination. 
NDA B.A., B.Sc. Computer Science, and B.Sc.

To get admitted to IIT Patna B.Sc. (Hons.) in Computer Science and Data Analytics course, applicants must meet the entry requirements - 60.0% in 12th. IIT Patna The total tuition fee for this course is INR 240000 for the entire duration of the course. To learn more about other courses offered under B.Sc. at IIT Patna.

Additional Details

Course Duration: 3 years

Mode: Full-time

Total Tuition Fees: INR 2.40 Lakh

Unique Feature: Hybrid (Online/Campus) mode of instruction

The admission process is competitive and requires candidates to meet both the academic and entrance exam criteria.

NIT Andhra Pradesh has not released the 2024 cutoff data for the M.Tech course. However, the GATE cutoff for NIT Andhra Pradesh in 2023, 2022 and 2021 can be different for each M.Tech specialisation and the candidates can be divided into different categories as well. Cutoff scores often depend on the number of students, the number of places and the standard of the entrance test. Check out the previous years' cutoff data from here: NIT Andhra Pradesh Mtech cutoff 

Admission to Woxsen University requires passing several tests of the Woxsen Entrance Exam, differing according to course. Students seeking to take undergraduate BBA or BDesign classes must first take the Woxsen Aptitude Test, which applies only for BBA. However, for the undergraduate programme in BDesign courses, it requires a mandatory Woxsen Design Test. In addition, it accepts students from Woxsen Joint Engineering Entrance Test (W-JEET) for a BTech degree, but some special programs may consider students if they clear JEE Main and GMAT exams from the national level.

Follow the procedure for applying to the NATA exam for B.Arch as follows:
Visit Official Website: Navigate to the official NATA website and then select the "New Registration."
Registration: Fill in the e-mail address and enter your desired password.
Application Form Submission: After logging in, provide your personal and academic information.
Uploading Documents: Attach your required documents, such as photographs and signatures.
Pay the Application Fee: Generally, this fee is around 2,000 for general applicants.
Submit: Look through your application and make sure to submit it before the deadline. Always keep a copy with you.

This makes your percentile extremely low. As CSE is a branch of pretty high demand, it is difficult for you to get it even in the tier-3 colleges. However you can get a seat if you go for any other branch like civil / mechanical.

You can only get admission in private colleges like galgotia, Amity, Sharda.