I didn't concentrate on my study Can't study for more time...

Hello saksi,
This is the problem which is faced everyone.
If you can't do study for long time then you can study in slots means you can study for 1 hour then take a break and then again study.
Watch movies listen music and feel fresh then again study.
And always think about your aim and think about what have you done.
Good luck.

Yoh should first relaxand take short breaks rather than going for continuous studies , take some nap and have good health. Also try to cultivate interest into subjects and start building confidence .

Eventually you will love the subject and start putting more effrots. Take short breaks and keep studying gradually so you complete in time.