Choosing btec options for adult nursing

I’m a year 11 student writing my exams next year. I was always wanting to become an anaesthetic nurse until i found out im not actually able to pursue that because i went for an open event and to do anaesthetic i need to do alevel science like biology and unfortunately i cannot do biology because they accepting grade was a 6 in maths, but i can only pursue a 5 in maths because in in foundation and the highest grade is a 5 . However for science and English I’m quite strong in that and I’m in higher tier so i can pursue a grade 6 and above.
Then i decided to choose a cardiac nurse practitioner as my second choice and i did my research, based on my research i have to become a registered nurse first. That means I can do btec. But now I’m faced with deciding if i can do level 3 health and social care (equivalent to 1.5 a levels) and a level 3 applied science ( equivalent to 2 a levels). But according to the college i went to for open event a teacher said that if i decide to choose level 3 applied science i cant do any other course, which is actually worrying.
I applied for an open event in a different sixthform college
Now im thinking if i should reconsider my options cause im so confused.

Is the applied science BTEC a national extended diploma or a national diploma? If the former, it makes sense that you can't do another subjects as it would be equivalent to three A levels. If it is the diploma, then you would need another qualification to enter uni. Just for your information:
BTECs
National Certificate (graded P, M, D, D*) = 0.5 x A level
National Extended Certificate (graded P, M, D, D*) = 1.0 x A level
National Foundation Diploma (graded P, M, D, D*) = 1.5 x A levels
National Diploma (graded from PP to D*D*) = 2.0 x A levels
National Extended Diploma (graded from PPP to D*D*D*) = 3.0 x A levels
Entry requirements vary by uni. Use the following search tool to find courses you would consider and then go to the uni's course page and check the entry requirements:
https://www.healthcareers.nhs.uk/career-planning/course-finder

I’m a year 11 student writing my exams next year. I was always wanting to become an anaesthetic nurse until i found out im not actually able to pursue that because i went for an open event and to do anaesthetic i need to do alevel science like biology and unfortunately i cannot do biology because they accepting grade was a 6 in maths, but i can only pursue a 5 in maths because in in foundation and the highest grade is a 5 . However for science and English I’m quite strong in that and I’m in higher tier so i can pursue a grade 6 and above.
Then i decided to choose a cardiac nurse practitioner as my second choice and i did my research, based on my research i have to become a registered nurse first. That means I can do btec. But now I’m faced with deciding if i can do level 3 health and social care (equivalent to 1.5 a levels) and a level 3 applied science ( equivalent to 2 a levels). But according to the college i went to for open event a teacher said that if i decide to choose level 3 applied science i cant do any other course, which is actually worrying.
I applied for an open event in a different sixthform college
Now im thinking if i should reconsider my options cause im so confused.