Find a classmate who does better than you and ask to be a study partner.
I got less marks in 11th physics, can anyone suggest a better way to get good marks? I can’t choose private tuition since it not affordable for my family in Qatar?
You could download tests from your computer, or by revision books, OR you could just revise online :)
You can choose online tuition service. It provides affordable rates always. There are many online tution service websites. Tutorcomp,vedantu,indeed are the topmost sites. You can hire tutors at QAR. 21/hr from tutorcomp and also they provide 30 mins free trail session. Choose the websites if you feels affordable.