If you can, try to buy a gaming laptop, in that way it can do a lots of things efficiently, engineering contains lots of CAD and other softwares.

It should be a SSD(Soild state drive ) and not a HDD(hard disk drive ) ssd are X4 faster than hdd so you must look for 256Gb HDD and you can buy a external 1TB HDD for around 2,000 Birr if you need too, and you must look for 8 or more ram and make sure it is labeled "DDR4" and Not DDR3 DDR4 are A LOT faster than DDR3 and they also use very little power compared to DDR3 so make sure it have 8Gb or more of DDR4 ram Processor I think a 7th generation Intel will do good You can find this kind of PC around 20- 25k