Hello

If you are applying in CDs exam for ota you need work hard on English and General knowledge

For IMA, AFA and INA elementary mathematics also in syllabus.

You can prepare for the exam in short time but you need work very hard to get selected in ssb

As now you are in 2nd year , you can start preparing for the general knowledge very thoroughly because that portion is very vast. English part is also tough so have to make a routine to and give atleast 2 hours everyday for either of the subjects. The very important part is the sample papers after you are done with your book preparations when there is 1-2 months left for your  exam start doing sample papers and previous year question paper. This will help alot . And the most important thing is you need to start making changes in you personality to built that OFFICER QUALITY to get selected in ssb.

Hope you succeed and be a part of our INDIAN DEFENCE SERVICES.

ALL THE BEST!