If a student fails in 2 or 3 subjects in HSC boards, can he/she apply for improvement exam if he/she wants to improve his overall score?

Yes, you can appear for the 12th improvement exam even if you're currently pursuing a Polytechnic course, but it depends on a few key factors related to your board and eligibility.

You can give the improvement exam next year after passing 12th, but not if more than 2 years have passed.

You can appear in one or more subjects.

You will get a new marksheet with improved marks.

Yes, doing a Polytechnic Diploma does not disqualify you from appearing for the 12th improvement exam. Many students do this to,

Improve marks for competitive exams (like JEE, NEET, NDA, ).

Meet minimum eligibility for degree admissions.

Qualify for better job opportunities later.

While it's not strictly necessary to solve Maharashtra 12th sample papers for the board exams, doing so can be highly beneficial. Here are some reasons why you must practice them:

1. Sample papers help you understand the structure and format of the actual exam, including the types of questions that are typically asked.
2. Practicing the Maharashtra 12th sample papers allows you to develop your time management skills, helping you to allocate the right amount of time to each section during the actual exam.
3. Working through sample papers can help you identify topics where you may need more revision or practice.
4. Regular practice can boost your confidence, making you feel more prepared on exam day.
5. Sample papers serve as a good revision tool, reinforcing what you've learned throughout the year.

If you choose not to solve them, make sure you have other effective study methods in place, such as reviewing your textbooks, attending revision classes, or studying with peers. Ultimately, the key is to find a study strategy that works best for you.