Chair for long sitting hours

For context, I am 5’7 55kg

I need a comfortable chair for ling hours of sitting since I am studying for 5-8 hrs a day as a college student. Okay po kaya itong model na ito?

I can up 5-7k lang po kasi budget and sana tumagal ng more than 10 years para po sulit hehe.

Nasakit po kasi lower back ko sa normal generic na office chair na gamit ko ngayon at hindi rin makaupo straight for 1 hr.

Any reco po? Wala pong aircon yung kwarto ko, yung goods din po sana sa mainit na panahon kasi mainit po sa kwarto ko