My sister got into a Russell Group University with a BTEC and one A level

Basically, Yes.

My btec this year was not easy at all. I stayed up many nights completing coursework and had to plan, film and edit 4 different project. The only advantage the my BTEC had to the A level I was doing was that I was more in control of my grades because my teacher would equally mark stuff and tell me if I need to add anything etc. Doing A level was just memorising info and learning how to put it in an essay, it was only stress for me towards exam season but that was because i was just getting nervous and was a wreck and just felt under pressure.

I did enjoy doing BTEC more tho as stressful as it was it was more practical and I was doing what I love.