Could you guys help me in this? Looking into chords doesn't always work in recognizing a scale. So what more elements should I consider?
Identify the tonic - find out where it resolves to, then identify the key if possible from the chords - then look at the melody and see what potential scales are there - look for notes that batch with chord tones to point you in the right direction.
Actually called Mark!

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i wanna see a clip of a recto buying some groceries.

The final note the song ends in determines the key.
Work out the notes within the key from the chords or by playing along lead/melody sections.
Take a wee look.
On playing the Paul Gilbert signature at the guitar store extensively, my missus sighed:
"Put it down now, It's like you love that guitar more than me!"
In Which I replied.
"Well it has got two F-Holes!"
Quote by Nameless742
The final note the song ends in determines the key.

If I may add, this only works if it is a cadence . It won't work all the time.
There's a good chance that what I've written above is useless and if you take any of the advice it's your own fault.