Advice - LSE econ or Imperial Maths?

I have an offer for Imperial Maths and I am currently studying economics at LSE, however my imperial offer requires 70% first year average and a grade 2 in step 2 or step 3.
I am unsure what to do - should I try and revise for both my lse exams (5 of them, not at all trivial exams either) and STEP, or should I just stay at LSE and focus on getting good grades in those.
For context I have been preparing for STEP since January with a month break and I'd say I have improved a lot, but the newer papers are harder and its a gamble especially since revising for STEP will probably make my LSE performance worse
I really love maths and I do not inherently enjoy econ anymore and I'm not bothered about all the high finance jobs with LSE since I'm not that type of person - I have autism and social anxiety I can't even join a society lol. I realise this won't change at imperial and I need to do something but idk how
So do I risk revising for both for imperial maths?
Thanks

I'd say to devote as much time as you need to be sure you will do well in your LSE exams, and then any time you have left over to put into STEP practice. Because, whether you stay at LSE or move to Imperial, you need to make sure you do well in your LSE exams, so this should be a priority.

OK thank you and do u think it would be worth it to go to imperial, if I meet the conditions?

yes it's worth it

thanks - any reasons why? I'm interested

well firstly it's pretty clear you don't enjoy econ so you would be better off doing something you do enjoy.
maths as a degree is better than econ and is 100% worth it at Imperial. it leaves more opportunities open. high finance and internships aren't your thing which is basically the entire environment at LSE. you'll enjoy Imperial way more.

OK thank you and do u think it would be worth it to go to imperial, if I meet the conditions?

I also think so, for the same reasons as the other reply.