Question to the technicians among you: Which convertible notebook / 2-in1 tablet do you recommend?

I would be really grateful for answers, because I unfortunately do not know myself in the subject area.

My use: for the university so that I can write / mark / draw during the lectures on the PDF files / PowerPoint (is the most important); solid battery life; rather tablet with keyboard and pen sought / desired; if possible 11-12 inches otherwise 10 would go too; not too hard; Device should not run slower after a few months / have display defects

The price should be under 700.

I myself use the Lenovo Miix 520 for my studies. It costs just under 1000 euro (with student discount).

If you want to draw with a pen like you say, you probably will not get far with 700 euro. It may be that you find one for the price. But that will probably not be so future-proof and after a few years run relatively slowly.