Max rev with gradual speed.

Bought an aveo hatchback 1.6L like 3 days ago. Everything looked normal. Now i noticed whenever i start the car in the morning (cold engine) it revs too much with little power. Gear shifts at more than 3200 rpm from gear 1 to 2 even though i rev gradually.

After 10 minutes of driving. The car goes back to normal. When i pedal after a red light. It goes much faster and shifts gear faster too with less rpm.

This morning it even moved very slow just like when in idle with no revving (like 5km/hour) despite the fact that I was revving like crazy :(

What seems to be the problem?
Oil was changed by the seller. I checked it and looks yellowish not dark.

take that car to get checked out, that sounds bad.

maybe clutch or band worn out, maybe you are in extreme temperature conditions.

I Read some threads and i guess that it's the fluids AFT that needs to be flushed.
If it was bad clutch or transmission as a whole it wouldn't go back to normal after 5-10 minutes drive. This means that the fluid was thick then it expands as it gets hotter.
Can't afford to get it checked as i am a student and I Sunk all my budget on that car (purchased 3 days ago)