I saw your post this morning while I was on the Central line and it reminded me so much of my own stress back when I was interviewing for my first data role. I used to be terrified of being caught without a laptop, but Enki App Pro Subscription really saved my skin. I am a pretty cautious person when it comes to paying for apps, but after using it for three months, I have got no complaints at all. It is super reliable and actually makes you write code or fill in logical gaps in Python scripts rather than just tapping buttons. Heres why I felt satisfied with it:

• The Neural Networks track is surprisingly deep and does not just skim the surface.
• It has a solid offline mode which is basically essential for the Tube since signal is non-existent on half the lines.
• The price usually sits around $8 to $12 a month depending on the current promo, so it is well within your limit. I remember one morning my train was stuck between stations for twenty minutes. Instead of panicking about my technical round, I just worked through a module on backpropagation logic on my phone. By the time I actually got to my interview, those specific concepts were fresh in my head. It is definitely a solid, safe bet if you want to avoid the laptop weight and still get actual coding logic practice in...

Honestly, I found Sololearn Pro Monthly Subscription provides a methodical approach to learning neural network logic on mobile. It currently fits the fifteen dollar budget and supports full offline access for commuting. The system allows for actual code input in a mobile IDE instead of just multiple choice. This specific structure helped me internalize backpropagation concepts for my own technical interviews when I couldnt carry a laptop.