FEW POINTS ARE :
1. As a fresher, one should know the procedure of SSB from day 1 to day 5, how screening is done and why lots of candidate get screened out on the day
2. You must know about various ranks and stars on the shoulders, (in case of Army), the weapons used by the regiment you want to join, how infantry is divided further like section, platoon ,regiment etc, role of various units in battlefield, tanks, artillery guns etc.
3. Solve OIR questions on daily basis. Now this is really important as lots of candidate do this mistake underestimating these questions. So prepare well for it
4. You must focus on current affairs on National & International events and GK of few months.
5. Practise speaking few lines on a topic in front of mirror, when you are sitting with friends go for a debate about a topic they are interested in.
6. Watch the SSB procedure on youtube.