Hello Sai kumar, some of the features that you need to consider while buying a new laptop are-

• It must have a good processor(preferable ones are i5 or higher)
• It must have a good ram(Preferable ones are 8gb or higher)
• It must have SSD storage, as it is very fast and convenient.
• It must be inbuilt with good graphic card.
• It must have atleast 15 inch of display
• Battery life must be good.

Inorder to work on Catia/Solidworks design courses, some of the best laptops are-

• HP Pavilion 15-cx0056wm
• Acer Predator Helios 300 PH315-52-78VL
• GIGABYTE AERO 15 Classic-SA-F74ADW
• MSI WS65 9TL-685
• Lenovo ThinkPad P72

Hope this helps.

Thank you.