Sorry you've not had any responses about this. Are you sure you've posted in the right place? Here's a link to our subject forum which should help get you more responses if you post there.
You can also find the Exam Thread list for A-levels here and GCSE here.
Just quoting in Fox Corner so she can move the thread if needed
I recieved BBD in Maths, Chemistry and Physics respectively and I would like to know is it worth reapplying UCAS next year just to retake some exams. I would like to go into engineering in mechatronics/robotics if that helps.
You might get a clearing place this year on a degree with a year in industry - have you looked? You could also consider a Foundation Year.
If you want to resit you can but if you know what you want to do it is worth looking this year.