CBSE 10th

Yes, you are eligible.

Don't think about job just after 10th. It's good that your thinking about your future but it's not the right time. Study hard to get a good college with good placement scenario so that you get a job just after your graduation.

Prepare for JEE Mains as IIST takes admission through JEE Mains rank. With that you need to qualify JEE Advanced to become eligible for IIST. Join some coaching or take a correspondence course as cutoffs of IIST are quite high and a thing here or there may cost you a seat you have enough time now to prepare for the exam. Just remember your goals and work for them.

Follow up your regular textbook. I am pretty sure if you do well you will be able to attempt and solve most of the questions in the exam, just try not to mug up the concepts, try to learn and understand them.

Repeat your 10th its not a shame, shame is not to try again give yourself a chance a give your effort this time and make this time count, never loose hope if you try and give your 100% you wouldbe off with flying colors this time. All the best.

You can get a job after completing Diploma but the job profile won't be quite good, it would be a low salary job so if you could try to continue your studies and increase your chances for a better job.

Some government schools apart from considering 10th marks also conduct their own exam for admission so you can look for a school near your place and give it a chance. For that you need to study well so work on your weak topics of class 10th.

It totally depends on you. If you want to become a doctor (BUMS or MBBS) and want to do pharmacy course, you can choose science stream. If you want to become an accountant, CA (Chartered accountant) or Company Secretary, you can choose commerce stream.

In my opinion you will stand a better chance by applying next year if you plan to give the exam again. Else, just go for your profile evaluation for Global MBA programme offered by N.L Dalmia if you have a good past record and want to study with top international MBA institutions.