CAT

If you belong to general category, then for IIM, 99 percentile is upper and 94 percentile is the lower cut-off. For NDIM, approximately 50 percentile is required, but if you score more than 90 percentile, then opt for FMS, DU.
If you opt for FMS, DU, your salary package can be up to 5 lakh rupees.

You can opt for either Bull's Eye or TIME. Both the institutes are good for the preparation of CAT exam.

You graduation marks are required at the time of admission. Try to clear all your backlogs (if any). Maintain the 50 percent aggregate throughout your graduation.

For taking CAT exam, you must be a final year graduate student or you should have completed your graduation.
So don't worry about 1st-year marks, you can improve it in coming years if you put some effort.
For CAT or other management exams, degree marks are not considered. You can attend it, but it is up to the college where you take the admission, marks are compulsory or not.

TIME Institution's study material notes are the best if you want to focus more on quantitative aptitude and data interpretation.

Hi Pandurang, the cutoff for Open in 2014 was 99.85 for MH-CET and for CAT it was 99.99 percentile.

Academic scores dont effect your selection. You will get select on the basis of your CAT score and your GDPI score. You need to score atleast 95 percentile in CAT to get admission in DFS.

TIME and CPLC are two best coaching institutes. Career launcher is another good option with good faculty.

If you have a strong determination and you are a hardworking person, you will surely earn it within a year. Try to reach any good coaching institutes nearby as they provide you with good guides, mock tests, etc. Don't try to study by yourself because that won't help you to attain a good percentile.